Improving Positional Play at 1400

At my level, players still blunder quite a bit, and I can play to my feel for the game without thinking too much about it. That said, I'd like to add to my toolbox and develop a positional game through experience. I exclusively play the Italian Game as white and wonder if I should add a new opening (the london system, Ruy Lopez, etc.) and/or spend my time in games looking at strategic pawn breaks, targeting weak pawns, etc. What do you think would be most helpful? All comments appreciated.

There is a book called Pattern Recognitionfor Beginners, that focus on basic positional patterns. 

Did the book help? I tend to learn from experience, but if it really ingrained some core principles, I'd be willing to give it a shot

I really like John Bartholomew, and that sounds great to check out. When you play d4, is there a line you've enjoyed, or was it something you just started exploring

Possibilities for middlegame help:

https://www.chess.com/article/view/how-to-play-positional-chess

https://www.chess.com/article/view/test-your-positional-chess

https://www.chess.com/article/view/do-you-really-understand-positional-chess

https://www.chess.com/article/view/get-ready-to-test-your-positional-chess-again

https://www.chess.com/article/view/can-you-pass-this-positional-chess-test

https://www.chess.com/article/view/how-to-calculate-long-term-advantages-in-chess

https://www.chess.com/article/view/learning-basic-pawn-structures

https://www.chess.com/article/view/learning-pawn-structure-for-chess-players-under-2000

https://www.chess.com/article/view/your-pawn-structure-is-your-friend

https://www.chess.com/article/view/more-pawn-structures

The Most Instructive Games of Chess Ever Played by Irving Chernev (1965)
https://chessbookreviews.wordpress.com/tag/most-instructive-games-of-chess-ever-played/
Seirawan stuff:
http://seagaard.dk/review/eng/bo_beginner/ev_winning_chess.asp?KATID=BO&ID=BO-Beginner
http://www.nystar.com/tamarkin/review1.htm
50 Essential Chess Lessons by Steve Giddins
https://web.archive.org/web/20140708100833/http://www.chesscafe.com/text/review534.pdf
http://www.gambitbooks.com/pdfs/50_Essential_Chess_Lessons.pdf

Amateur's Mind by Jeremy Silman
https://web.archive.org/web/20140708094419/http://www.chesscafe.com/text/ammind.pdf
https://www.silmanjamespress.com/shop/chess/amateurs-mind-the-2nd-edition/

Simple Chess by Stean

https://web.archive.org/web/20140708104258/http://www.chesscafe.com/text/review400.pdf

http://store.doverpublications.com/0486424200.html

Chess Secrets: The Giants of Chess Strategy by Neil McDonald
https://web.archive.org/web/20140708092313/http://www.chesscafe.com/text/review620.pdf
Chess Strategy for Club Players by Herman Grooten
https://web.archive.org/web/20140708101926/http://www.chesscafe.com/text/review696.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/9042.pdf
Chess for Hawks

https://www.newinchess.com/media/wysiwyg/product_pdf/9041.pdf

Chess Strategy: Move by Move by Adam Hunt

https://web.archive.org/web/20140708093249/http://www.chesscafe.com/text/review890.pdf

The Power of Pawns by GM Jörg Hickl (2016)
https://chessbookreviews.wordpress.com/tag/the-power-of-pawns/
https://www.newinchess.com/media/wysiwyg/product_pdf/9034.pdf

Masters of the Chessboard by Richard Reti

http://www.thechessmind.net/blog/2012/4/1/book-notice-richard-retis-masters-of-the-chessboard.html

keep in mind that learning positional chess can be a bit boring..unless you want to be a professional

Yeah, I play Nf6 as black against d4 openings, and people do seem less prepared. I appreciate your thoughts on this. Those are some good rec's

Ha, the boring part has kept me from it, but challenging myself is part of my enjoyment. Don't get me wrong, I love looking to attack the king

me too! but anyway i am lower rated than you..

Good Positional Chess, Planning & Strategy Books for Beginners and Beyond...

https://www.chess.com/blog/RussBell/introduction-to-positional-chess-planning-strategy

discover...

https://www.chess.com/blog/RussBell

Yes for me too 1 d4 was a lot more control and winning...

Thanks for all the advice, you all!

"... In order to maximize the benefits of [theory and practice], these two should be approached in a balanced manner. ... Play as many slow games (60 5 or preferably slower) as possible, ... The other side of improvement is theory. ... This can be reading books, taking lessons, watching videos, doing problems on software, etc. ..." - NM Dan Heisman (2002)
https://web.archive.org/web/20140627084053/http://www.chesscafe.com/text/heisman19.pdf

the only way to improve positional play is by combining with endgame. but the opening and midgame must suit to it. some players turn to Gambit like me

the only way to improve positional play is by combining with endgame. but the opening and midgame must suit to it. some players turn to Gambit like me

I mainly play on Lichess, but for the last month or so I have been testing out Knf3 as the first move. And after black respond I will decide if I will follow up with c4, d4 and etc. I feel the positions is WAAAAY more easy to shape to my taste/benefit. It will be more positional and more easy to shape the game to either kingsside, queenside, centerplay and etc. But it's not easy to play in blitz as a downside.

Not to my knowledge, but I'm wondering what brought that up

That's a good thought. I'm always impressed when a super GM decides an attack is over and to simplify