thank you for the helpful tips!
my target load is 200 gr lswc on top of 4.0 gr bullseye, a very comfortable recipe i got after reading many, many posts on various sites on the web. i will try some 230 gr bullets as you suggest once i get my hands on some.
over at m1911.org many RIA owners have stated that their tactical shoots low and often to the left out of the box, but I will certainly hand mine over to a more experienced friend who can corroborate my guess that my gun is shooting low. i will definitely use a benchrest when sighting in.
re swapping out the rear sight i have read that ria sight dovetails are cut smaller than most, and if i'm going to be filing away the dovetail on my new rear sight to make it fit in my slide, i might as well just file down my front sight first.
after getting friends' input i will start slow with filing. heck, if i sight it to COM first, i can always salvage by further filing it to 6 o'clock, and if i REALLY blow it, i can file the rear sights too, right?
just kidding, i will be conservative, and yes, i do know i can use the formula for calculating how much to take off. thank you guys!