So I went ahead and ordered the Shooter's Pak TYPE-2 reduced power mainspring for my S&W 65 revolver and all I can say is holy! It comes with reduced power power rib mainspring and 3 rebound springs in 13, 14 and 15 Lbs.
The power rib is easy to install but the rebound spring is a bit trickier specially for somebody with sometime clumsy fingers. But a pair of fine needle nose pliers saved the day holding the 14 Lbs spring.
The difference is AMAZING. Much easier to shoot double action and it feels a lot smoother for some reason. HOWEVER, do not even think about shooting single action, you lay your eyes on the trigger and it will go bang.
I tested it with some resized & primed cases and it popped them every time without a failure. I will see how well the gun goes at the IDPA match this saturday.