I've run just over (as of two weeks ago) 6,000 200gr LSWCs from three different cast bullet suppliers through my SR1911. (All are based on the same #68 H&G design.) These are modest loads -- 5.0gr Unique with a COAL of 1.25".
I use Wilson 47D magazines; they perform flawlessly. I don't have confidence in the Ruger factory magazines from Check-Mate, a topic I discussed extensively many months ago. I'm perfectly happy with the 18.5# spring from Ruger. I tried 16# and 14# Wolff springs and experienced no improvement. I went back to the 18.5# spring because shooting the SR1911 with this spring/load combination just feels good. (I do note, however, that Ruger is now selling a 16# spring as the standard replacement.)
When I find something that works, I stick with it. With this load I've experienced almost no malfunctions in my SR1911.
I will point out, however, that the SR1911 has difficulty ejecting a loaded round with any bullet, which is necessary at the end of every stage in a PS match. I'm just guessing, but I think this is a result of a longer-than-standard ejector. But this is another topic...