Glock pistols are quite serviceable as they are. IMO there is little to gain by lightning the trigger pull, and frequently the lighter striker spring causes misfires with some primers. However, Glocks can perform better in certain applications by tweaking and changing a few factory parts for aftermarket. I'm not one to buy into the "Perfection" hype that Glock has worked so hard to sell us. All my Glocks have a few aftermarket parts, some have several.
It's best to decide what the pistol will be used for, and modify it accordingly, verifying at each stage of the process reliability of the pistol. The modifications you mentioned, will certainly change the feel and operation characteristics of the pistol. You may love it! If not, it's easy and cheap to change. That's part of the fun in owning a Glock if you like to tinker! Have fun, but keep it safe and reliable. Savage
Couldn't have said it better, myself! Exactly my own philosophy. I don't build, 'range pistols'. Everything I do with Glocks is for street carry and self-defense work. I'm not going to tell you what to use - That's your business. I will, however, tell you how I do it: Everybody has a favorite connector. The two that I've found most serviceable are from either Lone Wolf Distributors, or Ghost, Inc. (In a pinch, I'll even use a standard factory 3.5# connector!)

If you do anything with the factory spring set, increase rather than decrease the weight of each spring. (Except, perhaps, the recoil spring) I use Wolff, '+ power' Gunsprings. The trigger pulls aren't all that light, typically 4.9 to 5.2#'s; but the break is very clean. I take the slop out of a Glock's trigger by backing it up with a Lone Wolf, 'Ultimate Trigger Stop' that I set permanently in place with epoxy paste.
The final thing I do is to get rid of the factory's plastic recoil guide rod. I replace it with a non-captured steel guide rod and spring from Wolff Gunsprings. I, also, lubricate my Glock's slide and connector with a high-tech gun grease from Sentry Solutions. All this does make a significant improvement in how your Glock will handle and fire.