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Saying you polished the ramp, isn't specific enough. Were you working on the barrel, or the frame? If it was the frame it sounds like you made the slope steeper, or dished it. So, that the bullets are not deflecting up. If way too much material was removed from the frame area, then they might be hanging on the lower lip of the barrel ramp.

The general idea is to make slope of the ramp less inlined. A gentler slope.

Did you disassemble the RIA to work on it, or simply lock the slide back and try to polish going straight into it?

fwiw, it probably IS salvageable. FTF on RIAs was a common problem. That's because they were building straight off old G.I. specs. So, the list of problems that folks had with varying ammo over the last 100 years or so of the life of the pistol, were more or less built in to the RIAs. (What used to be a bug, became a feature.)

I polished the frame ramp on my RIA, with the slide off. Before taking the slide off I scribed the frame with a razor knife where the edge of the barrel ramp met the frame. That gave me warning line. I didn't dare go past that line toward the front of the gun.
I used a fine grit chain saw sharpening file. It is a round file, about a foot long, and is straight with no taper. They come two per package in the hardware section of WalMart by the chainsaws.
The key for me was to make stroke on the ramp to take out any regularities. Using the file pressed flatly on the frame ramp, I attempted to take metal off the top of the ramp. Make sure the ramp all turns out flat.