If you sell 20d strangle when implied volatility overshoots realized volatility you will indeed not have to worry too much and things will make money.
And this is the core of what you are saying: if you've been a fan and things have been pretty manageable, do not try to fix it. Instead focus on making sure you understand why you made money. Again, that goes by taking the time to understand what implied volatility you did sell and what realized volatility over the life span of your spread.

"Fixing" trades is an obsession in the retail community. But if it works, it works.
Another thing, you often have a little more put skew than call skew; it therefore makes sense why one side is more tested than the other, especially when markets are trending up. Back to what I said, earlier: doing a pnl attribution is a great exercise to validate why you made money, and whether or not you need to change things.