The 4th game was the most "turtle-factor" game of those 4.
The 1st game - I see risks in a black opening that needs to push the g- and f-pawn in front of the own king. Game 3 showed that sacs can happen, but well, these sacs in game 3 were really harmless and just bad, and we can not force our opponents to play calm. We can only play calm ourselves. game 1 still looked reasonable safe, but maybe the opponent wasnt feeling like playing gambit-style against you.
The 2nd game - opposite casteling is a risk - the game tends to become sharper. However, I am not a saint myself, I play:
1.e4 Nc6 2.d4 d5 3.exd5 Qxd5 4.Nf3 Bg4 5.Nc3 Qh5 6.Be2 Nf6 7.O-O 7...O-O-O 8.h3 e5 --> I castle long and sac my bishop. That isnt turtle play, but I studied the tactics here so well, I feel positive and confident to play this as black. However, it is not Turtle play.
For that very reason, I developed a back-up: I play the O'Kelly sicilian against much weaker players. Not really that safe, too, but at least both sides play O-O, and it isnt relying on sacrificing something.
My game this week against Smit, who played a b3+e3 system against me, made me think. That system can be played both as white and black against all openings. So you could choose to get highly skilled in that setup since you could opt for that system in 100% of your games with both colours. Here is the Smith game again.
After analysing this game and getting the idea of playing it with both colours at an extreme high skill level, I did some source searching. I was very happy to find 4 video's of GM Igor Smirnov, who earlier taught me some nice lessons. So I watched those.
b3 part 1: https://www.youtube.com/watch?v=21ZQnlIJJKM
b3 part 2: https://www.youtube.com/watch?v=ONRfnAhtnpI
b6 part 1: https://www.youtube.com/watch?v=5-ACdKjp4QQ
b6 part 2: https://www.youtube.com/watch?v=KpEJdebvXQY
I also downloaded, and still need to study:
Well, finding a book from Bauer and video's from Smirnov made me wonder. Those guys are good in setting up tricky systems. The more I reviewed some lines from the database in Stockfish, the more I liked the system. Sure white does NOT get an evaluation edge, and as black you get 0.3 disadvantage, but that's not the aim. The aim is to get in familiar positions and get the advantage in the middle game as Ladkawala says in his book.
Since the evening of the day I studied these systems I had a rapid tourney at my club, I played all my 4 games with b3 and b6 as a test. Scoring 4 out of 4. Right after the games I quickly notated the games in my phone.
I am positive and will keep playing this system. I already tried the "getting highly skilled in 1 opening system idea" with the Modern Tiger and Hanham system with both colours, but that didn't work out. I have to say getting b6 against me always made me laugh, but as it turns out, black has many resources. You give a way the center to attack the center.