I've changed to Wilson springs in a M29 and a M10, and in both cases the gun has function flawlessly and the trigger was much improved. In the M10, I ended using the lightest trigger return spring 12#, but in the M29 that was too light and I moved up to the 13#.

That said, I certainly did test my carry ammo after the swap since both guns are CCWs.

I don't polish the internals. I've found that several hundred dry-fires does the job fine for me.