If you want a light trigger, you'll get that with springs. Lighter striker spring, heavier trigger spring. As far as the kits, a lot of them is about eliminating over travel and pre travel. You may find that a 5$ worth of springs is all you need.
The 5# striker spring and extra power trigger spring feels the same enough to me as the 4.5# with the stock trigger spring...but the former ignites all primers so that's what I use.
I have a lot of it and use 3.4 with 147 SNS from a KKM barrel Glock 34. It works fine. It meters amazingly accurate. It seems smokier than Bullseye using coated bullets. It is easily makes PF with .40 so it's nice to have it around. It makes the the powder hopper turn grayish/black which is slightly annoying.
I've had inconsistent results with the Zev Competition Spring and lightened strikers. Pretty sure the Zev "Competition" spring is just a 4# spring. Seeing as how I get the same results on a trigger gauge from the Zev to a 4# spring, Wolf or Ghost. FWIW I had problems with Fed primers too and the 4# Zev combo. I up'd it to a 4.5# spring and still had issues with the Zev Striker - but I was not having problems with a stock striker and a 4.5# spring. I got rid of the Zev and went with an IDP striker and had no problems until I wore it out after about 50k rounds. I measured the IDP and it was now a bit shorter. I assumed I eroded the tip or it got hammered on and deformed. I moved on to Jaeger striker and broke it almost immediately but Jaeger sent me a new one. Spring quality changes from lot to lot as well. I had a Ghost Spring got 15k rounds and a years worth of dry fire. I had one seemed to go bad in half that time.
I've not had an issue with the trigger not resetting. I have had it not reset all the way past trigger safety. Some triggers just change the angle of the shoe so the trigger safety clears much sooner. Some connectors change this a bit.
It's working good for me out of a KKM G34. Small flakes, meter great, very consistent, low SD, lower smoke. Very accurate. Using coated 147 RN with 3.08 g over 10 throws.