I too have an SR9. I find the trigger heavy as well (compared to others). There is a company called "ghost triggers"
http://www.ghostinc.com/ that make replacement trigger connectors. I ordered one (the 3.5 Rocket which requires fitting, the others are drop in) and have it sitting on my desk in front of me but have yet to install it as then I can't shoot production in IPSC. Unfortunatly Ghost does not ship to Canada (I had it shipped to a relative who brought it up for me, but you could have someone mail it to you). I think it was around $35 u.s. I have also read to cut a half coil at a time off the firing pin spring (to a max of 2 coils) which will lighten the pull and still have enough to fire the primer (I haven't been brave enough to try this yet with out a replacement on hand). Also taking the dremel and polishing every part of the trigger mechanism helps loads but more to get rid of the "gritty" feeling not the heavy trigger.