I trust that you have the late-style parts already installed? The early '20-coil' spring, sear with no hole, and 'dog-leg' hammer had an atrocious triger pull. You should be working with the '26-coil' spring, late sear with the hole or grind mark (or and M2) and the late hammer. they were adopted to alleviate exactly the issue you are addressing.

Assuming you have the late style parts, you can decrease the travel and pull a little bit by grinding the bottom of the hammer to reduce the depth of the notch, exactly like the procedure used by the Canadians on the C1A1. A bit too much and it wil follow-throughof fire doubles, but hammers are cheap, so try it on a spare hammer.