My new Fifth Gen 17 has a pretty good trigger out of the box, noticeably better than previous gens I've shot, but wonder if it could stand further improvement by installing a 3.5-pound connector? If so, which one would you recommend? Ghost? Zev? or ??? Also, do you experience any REAL lightening, smoothness or other plusses by upgrading? My gun guy says he'll install it for only 10 bucks. Are there any other "trigger jobs" that can be done for a minimal cost? Thanks in advance for any advice.