Though it is difficult to guess from here, your description is detailed enough to take make some suggestions.
With 1911s (especially) and many other pistols the feed ramp is a source of possible loading issues. With PX4 Storms I have found that it is not usually a contributing factor. I have seen some feed ramps that look like they have been in a fight and some that remain smooth and fine. They all load the same.
The incoming round will quickly bounce off the metal insert and contact the feed ramp built into the barrel.
So, failure to get past the feed ramp or getting stuck on it is different from failure to go all the way to battery. Yes, it seems conceivable that pieces of polymer are getting in the chamber, but it seems less likely and would run out of polymer to come off after a few rounds of that. I have also seen polymer damage that was more extreme from a blown barrel, that did not affect feeding. It would be good to make sure that under the extractor claw is clean.
Once the round is far enough in to be a failure to go to battery, it is past the ramps, anyway. The only time we have found FRTB (especially with a new rebound spring) is because of lubrication. It usually is helped with a ring of grease around the cam lug and some in the barrel's cam slot. Of course, some lube on the rails and barrel tube help, as well. This post goes into more detail of lubrication suggestions:
https://pistol-forum.com/showthread....ull-size/page3 post 27
I would not rule out the possibility that something in the re-finishing of the slide might be a factor. There have been more reports lately of issues after getting slides refinished.