Subcontracting EV charger installs in zone 5? Getting screwed on scheduling

Up here in north jersey, zone 5 winters make scheduling sub work a crapshoot, especially with these Tesla Wall Connector installs popping up everywhere. Last month I subbed out a 48A EV charger job to a guy with his own fleet, quoted him $1500 flat for the rough-in and panel tie-in using 6/3 NM-B, but he dragged his feet for two weeks because his main gig had him buried in service calls. I'm using Jobber for scheduling, but coordinating with subs is like herding cats, and I ended up eating $800 in delays from the homeowner breathing down my neck. Saw a similar rant on r/electricians about subs ghosting on panel upgrades, and someone in Electricians Network FB group mentioned the same issue with EV jobs. Anyone else dealing with this BS when subcontracting out?

Man, same here with subs on my lighting retrofits, always some excuse about their primary contracts.

Subs are the worst, they're out there making bank on their own jobs while you're stuck explaining to clients why the EV spot isn't ready yet. Time to find better ones or go solo on these.

Don't sub out EV stuff unless you vet them hard, had a guy botch a ground rod install last year and the inspector failed it twice, cost me a bundle in rework. Stick to in-house if you can afford it.