It's personal, and after a lot of read, result may vary from different brands and even from gun to gun with the same kits, but I got a ghost edge 3.5 connector and spring kit, with all installed I found it to be not only too light, but also the springs made some of the safeties not work.
Tried all the possible combinations, always not 100% safe, so I kept the connector and plunger springs only. Trigger return and striker springs are out of the equation for me.
Already had CMC trigger before those, but other than face geometry, mechanism is identical to OEM from what I know.