Shifting Issues in and out of gears driving or parked

I am having an issue after buying an aftermarket clutch. It is a stage three Southbend Daily and resurfaced OEM flywheel. Sometimes hard to get in gear when driving or when in neutral won't either get in or out of a gear and does it at random. No grinding of gears or making any weird noises. I have read in forums and seems like a common problem with all aftermarket clutches once installed in a subie, but none says what actually fixed it. And some do not have an issue and they changed all new flywheel as well. Can it be the resurfaced flywheel?

I have already changed slave cylinder and re-bleed system, and installed ACT monoloc and same issue. Some say pressure plate or stock throw out bearing goes bad after non OEM clutch. Also to check clutch pedal adjustment. I do not know if last shop has done that. Thanks for any help.