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15# seems kind of lite for a mainspring, especially if you are shooting near normal loads. 19# is more what I would use. The mainspring works with the recoil spring to control slide lock/velocity, so any time you change the main spring, you need to up the recoil spring to compensate. This sometimes generates a little controversy, as most folks don't realize that the mainspring has anything to do with slide lock/velocity, but if you think about it carefully, you will see why. The slide has to compress the recoil spring as well as push the hammer back against the force of the main spring. When the spring rates are off, the slide will unlock too soon & move too fast, battering the gun un-necessarily & sometimes not pick up the next round in the magazine.
Try tuning the sear spring by bending the left leg back a little to lessen the pressure on the sear. Proceed carefully. A little goes a long way. Test by loading 1 round per mag & test fire. If the hammer doesn't follow the slide, load 2 rounds. Test fire again. Then load 3, etc.
HTH , BBBBill
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