Improving From USCF 1500

I'm similar in strength to you. I have found working through Yusupov, Build Up Your Chess, The fundamentals (Book 1 of 9) to be very helpful. Be forewarned it is a LOT of work. I also found "The Amateur's Mind" by Silman to be quite useful. And finally, I do 10 tactics a day at chess tempo, and another 5 here every day.

Playing less chess and increasing studying can help you trade in time to study and set it in place. When studying openings and tactics you need to review them also. 5-10 minutes of tactics a day 3-5 days a week and reviewing the ones you didn’t get helps. Also finding the common themes and naming them help solidify what you are learning. I advise dvds on openings. Books except the move by move ones are best unless you are higher than 1700 otherwise its a jungle. Choose openings based on what type of player you want to be, do you like to attack, counterattack, play strategically, tactically? DVDs you can get in 10 minute segments and you can review the games easier. Look up openings and what they are like to see which is most comfortable to you. 

You don’t need to study openings 3-5 times a week. But tactics yes. Maybe chess once and study once a week when you want to learn something new. Learn the middlegame plans for the opening, every move has a purpose and each opening has its own middlegame plans. 

You have been a member for over 3 years, and played 2 Daily games.  All the rest...fast time controls. 

How are you expecting to improve, when all youre playing is speed chess?