You definitely looked better with the 165mm cranks.
Your talk of using a power meter is definitely a big clue. Your trying to push to hard/use too much power without first having sorted out your own personal balance/asymmetry issues.
You must slow down and sort out your balance/asymmetry issues as a matter of priority.
I really can't see you fixing this while going full steam ahead. Even PRO athletes have to take a step back sometimes.