Don't take any off the spring to start. Stoning the trigger top to 90 degrees (so the sear doesn't have to "lift") and polishing will usually get you 3 to 3 1/2 pounds of pull, with a lot of creep until you work on the sear.

"All the complexities, confusion, and distress in America, arise, not from defects in the Constitution, nor from a want of honor or virtue, so much as from downright ignorance of the nature of coin, credit and circulation." -John Adams