Since you have installed the S&A magwell, you are into the gamesman territory so will be using magazines with the extended base. These magazines are usually the 8 round type.
On my 1911, I prefer no magwell and use 7 round magazines (Mec-Gar) with the traditonal flat base. IMHO, less is more (when it comes to add-ons or modifications).
You want to the thing to run without a hitch at moment's notice. You don't know if it will until you have put 1000 rounds through the pistol without a single malfunction using your favorite load. The 7 round magazines are the conservative bet that this test will succeed.
When running the pistol at extended lengths, a little lubrication every 50 to 100 rounds is permitted and good for the pistol. Beyond that, you want the test as real-world and self-defense as possible.