I've got a LW Micro as well and had to take a miniscule amount off the frame where it meets the bottom of the feed ramp. I really didn't even take any material off the frame, just smoothed it out a little with a file and then used 2000grit car polish & a dremel to polish the 'dog' out of the ramp.
The symptoms to the problem I was having didn't show itself during firing, just when the slide was back & I'd hit the slide release. The tip of the round would get caught on the rough spot on the frame where the frame & feed ramp met.
After the above mentioned work which took maybe a half dozen passes with a fine file, everything feeds great now! With the ramp dry & free of oil, it is so smooth it feels like it's teflon coated :) I also used a torpedo polishing wheel and ran it into the chamber for a couple passes.
BTW, I had a few initial feed problems with the first ~25rds using the SA 6rd mags, but they went away. I carry with the 7rd Wilson mags.
Also, I just replaced the entire ILS system on mine, as I've been shooting IDPA with my 3" Micro, and lately, I've been getting an occasional light primer strike. I completely replaced the ILS mainspring housing and purchased a standard officers size mainspring (23lbs), an officers size mainspring housing, mainspring cap, mainspring retainer pin, Wolff XP firing pin spring, Ed Brown Springfield sized .38/9mm firing pin (special sized pin for the .45ACP Springfield’s).
This gun runs like a top since replacing the above parts with the standard officer parts. The firing pin strikes are extremely solid & well worth the ~$35 in parts.
Let me know if you’re interested in replacing the above parts & I'll post links to each part at Brownell’s.
Also, Brownell's only sells a 20lbs reduced power officers mainspring, the only way to get the 23lbs mainspring from Brownell's is to order the
Ed Brown 1911 Officer's Rebuild Kit which includes all the guts to the mainspring housing, as well as replacement pins & springs for the 1911.