throat question

I posted before about a failure to feed issue on my 9mm RIA. Ive been told to check lots of things, the magazines, extractor, breech face, among other things.

After checking all these and all seem to be ok, I have one question.

When a barrel throat is properly ramped as in grinding a ramp in no the actual ramp that exists on some barrels, does the throat have a straight ramp into the chamber? Or is it kinda rounded in towards the chamber?

Mine seems to be rounded in (and poorly polished, Its not smooth and mirror like some of the others i see on here). The bullet tips seem to catch on the shallow part of the rounded throat.

I see videos of people making it a flat ramp, and i have been considering...what do you guys think? Maybe before that i should just use a compound and polish it a bit before shaving meat off?

Also, I am mindful that there is a gap to maintain between the feed ramp and bottom of the barrel throat.

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throat question