I had the same problem so I took the springs out (mainspring and trigger spring) and cut a coil off of each and reassembled it. The result was an improvement so I cut another coil off of each spring and the results were a much improved trigger pull and it still reliably fires in both single and DA. If you do this go slow and do not take too much off. I did that on one Taurus and rather than buy a new spring I added a small washer to the bottom of the spring and now it works properly.