Before you do any ramping or other alteration, know this...
1. The 1911 platform--specifically, the .45 ACP--has been provided for some time with barrels that have already been throated for reliable feeding.
2. There are two "bumps" on the frame, each side of the feed ramp. These are called bullet guides, and they are there by design. Do NOT reduce or alter these in ANY way.
3. To check your 1911 for feeding reliably, do the following steps first: a. Obtain good magazines that have the feed lips configured for wadcutter ammunition. b. More than likely, you will be reloading unless you have a ton of money to spend on match wadcutter ammunition. If you are reloading, the secret is to load the round to the same OAL as a round of ball ammunition. The pistol is manufactured and timed to work with that bullet length. c. Make sure your round is taper crimped properly. I use a taper crimp of .470, measured at the case mouth.
In closing, check that your ammunition is within the same specs as a round of ball ammunition before modifying your pistol.