Yeah I installed the apex trigger kit as well but only added the trigger shoe itself into the lower as to keep the prp springs in it. It's a pretty nice shooter now.
How much pre-travel are you getting? How far is does the trigger move before the reset? Are you hitting a hard wall when you pull the trigger, or is it a soft wall? Can you post a follow up video so we can see exactly what you’re saying?
Yeah I get slightly better grouping. About as much as you'd get with a trigger that's 2lbs less in pull. But you still need practice. No upgrade will just make you a better shot.