Agree with everything you say. I was just being a cheapie when it comes to trigger work. You are correct that you can't beat real work from someone who knows what they are doing.doing the work myself, having the necessary tools already, I could do it for ~$10, to get a trigger pull in the range of 7-8lb DA, 2.5lb SA, and very smooth and crisp.
That cost is just to get a new 1911 mainspring. (actually, on the newer berettas, I'd want another ~$30 or so for a metal trigger, also).
D spring is a definite upgrade. A 17-18 lb 1911 mainspring is even better and still should work with all but the hardest primers. When I competed in ipsc/idpa with 92s I used a 15lb 1911 mainspring.
Smoothed out from use helps, but doesn't begin to compare to a real work-over, imo.
-rvb