Leber V2 L2 Prints help

Looking for help to get things running reliably. I have the complete package from L2Prints with the buffer, v4 slip, rounded trigger, etc, and upgraded my locking piece to the recommended 100 degree HK one on my AP5.

I've been testing mags (century arms, HK), and different grains/ manufacturers (mostly 115 and 124 grain brass round ball range ammo, but I can't seem to get it to run reliably. I've had some double feeds, but mostly the issue seems to be a dead trigger, where I will have a burst of fire, but then have a dead trigger. I then rack the bolt and an unspent round with no indication of the hammer striking it being ejected.

I'll try to do a deep clean and lubrication of it all but it's definitely not feeling very plug and play, any advice or found guides/ youtube videos would be appreciated. I went with the Leber/ L2 Prints as it seemed like many people have had great success