Just know that swapping connectors do make it more likely to have stoppages... The striker has less power, so hard primers or a dirty gun will cause stoppages. Stock triggers run like a top.
I second the recommendation to ditch OEM plastic sights. Good deals to be had on Mepro Night Sights (I think CRAFM had them for $80??)
Swapping a striker spring will cause the issues you're referring to, connector has nothing to do with it.
I try to run my 2 glocks (a 17 & 19) as stock as possible, stock meaning what glock does from factory without all the Gucci crap, and as simalir as possible.
Glock offers factory 3.5# connectors i.e. The "minus" connector which I run in both as I find the trigger pull is much smoother and has a much cleaner break. I also swapped the stepped trigger shoe for a factory smooth one, but that was only relevant to the 19 and I don't think 17's actually come with the stepped one.
I've done the .25 cent trigger job, polishing the trigger surfaces but I'm not convinced it makes a noticeable difference, maybe a slight improvement in smoothness of the pull.
Sights were a big one for me, so I swapped the factory ones to Warren tactical tritium front blacked out tears that I got from Tier One Armory in Edmonton for about 80 bucks.
The only Gucci part I run is on my 19 and is an agency Arms magwell, but only because it gave my pinky the few mm's it needed to not feel like it was constantly about to slip off.
Aside from all that not really necessary crap, factory mags or the magpul pmags. Don't buy those junk KCI mags.
I would shoot it a fair bit first though, no point in spending money if you're a ringer with a factory glock.