I think revhigh's point about 1911's is a good one. The "mod the 1911" subject is always an interesting one.
I suspect most of the guys on the typical gun forum are from the "Glock era" of firearm ownership. Their entire shooting life has been within the timeframe of the "Lego-like" Glock. They live with the understanding that if somebody makes a part for my gun, it will fit right in. Unfortunately, the 1911 is not like the Glock or the AR for that matter. Parts typically don't just drop in to a 1911, and they often require some skill and specialized tools to get them to fit. I've seen it often posted on some of the 1911 forums, that the only drop in parts on a 1911 are springs.
The mag release issue in discussion is a common one. The best and most economical answer is to just slap the mag harder. Most long time 1911 users don't even think about it. Heck, you should see how many guys post with problems trying to seat their new 8 round mags. Slap them in harder, they'll seat. You don't have to pound them, but mags typically don't just slide in to a 1911.
For a mag release, I'd avoid the Colt part, as I believe the problem you are experiencing is a design feature of Colt. You may find it easiest to just file your current mag release to allow smoother insertion of the mag.