It's hard to say, the quality of the Italian replacement springs is an individual thing and it might come out harder or lighter. Buy several to try or take it to a good gunsmith for a tune up. Reducing the strength of the mainspring will also have the effect of lightening the trigger pull but may also reduce the hammer impact to the point where it won't set off caps reliably or at all. If you look at the front grip strap you will see a screw down near the bottom. Turning it out will reduce the pressure on the mainspring somewhat. Tweaking the mainspring is done, in conjunction with other work, to give a good trigger pull and still bust the caps, not to ease cocking, if everything else is acceptable that should take care of itself.