Polish the feed ramp, then try HPs again. If they still don't work, you probably need the chamber throated.
A Dremel will do it, but if you've any doubt about your skill with said tool, get a pro to do it.
BTW, it's nothing to be worried about: LOTS of NIB 1911s -- regardless of the brand -- need this done in order to function with HPs, either at the factory or by the owner.
This is a VERY COMMON issue.
-- John D.