Firing a flooring helper who can't handle LVP clicks right

Been in the Chicago area my whole career doing mostly residential flooring installs, and hiring good help is getting tougher every year. Last month I brought on this guy thinking he had some experience with luxury vinyl plank, but he kept messing up the tongue-and-groove alignments on Coretec jobs, wasting half a day recutting boards. I tried coaching him through a couple installs, even showed him how to use the 45-degree miter for transitions, but it was clear he wasn't picking it up fast enough for the pace we need. Finally had to let him go after he botched a whole room layout, which pushed us behind on a three-day kitchen refloor. Now I'm back to solo work until I find someone reliable, maybe post in some local groups for leads. Anyone got tips on spotting the right apprentice during interviews? Firing sucks but quality work pays the bills.