So I've had my TP9SF Elite for about six months now and put probably 2,000 rounds through it without a single hiccup. The trigger is already pretty good and I've got it at about a 4.5 lb pull with a clean reset. My buddy keeps telling me to leave it alone and just shoot it, but I've been eyeballing the Grayguns flat-face trigger kit. Anyone go that route..Is it worth the $80 abd will swapping the trigger void the warranty?