How much experience with Glocks do you have?
The 3.5 pound connector will make the trigger pull lighter, but not necessarily
better. The trigger will have a more consistant resistance from start to finish, like a revolver.
When I used a 3.5 pound connector, I added the NY-1 trigger spring to bring the trigger pull weight back up to 5 pounds. This also improves the trigger reset and is a great action shooting trigger, but not the best for bullseye.
Some will argue that a light trigger on a self defence gun is a liability (physical liability, not legal). I tend to agree.