Brutus,
Sorry to hear you are having issues.
I would like to make a couple suggestions.
Try removing the grips altogether (unloaded of course) then handle the gun and see if your trigger finger alignment continues to be an issue.
This will give you some idea if the flat panels would even be an option for you.
This is a free experiment and will give you a rough feel for whether or not you will like the gun with the flat grips.
From your comments, it sounds like your regrip issue is in SA, is that correct?
Maybe try some dry firing with and without the grip, so if your point of aim changes.
I only suggest some experimenting because it can be free and may point to an issue other than just the grip width. (i.e. grip width vs. grip length) I get a better purchase on mine with a larger grip actually but I have large hands, but my wife (XS glove) shoots it fine with Nills Masters grips and they are very large grips. So shape can have an impact as well.
Also if budget is a concern and removing the grips allows a better trigger reach, maybe consider sanding down the checkering on the grips.
There is actually a bit of meat there than can be removed, I know as I have been experimenting with a pair that I bought (trying to create a semi palm swell be thinning out some areas)
The other items i would not worry about until you decided if the grips are a no go item, they can be done later.
And if I was replacing the barrel bushing I would have Schmeky do the Enhanced bushing instead of the stock one, just because!
Hope I did not waste your time, but it sounds like you like to tinker anyways and it sucks to sell a gun and later figure out that the one you replace it with is not any nicer than what you had.