It's probably the trigger, and by that I mean, not necessarily the type of trigger.
I'd try an ALG ACT trigger if you don't mind spending that kind of money on a milspec trigger. They are as strong as a milspec but lack that gritty-grindy feel of a milspec.
If it is a drop-in you seek, Rise Armament makes one for PCCs as well. I little pricey, comparatively speaking, but not ridiculously so.
Is the ACT rated for PCC use?
Geiselle is always the name which comes to mind