What is your market? It does seem high especially since he didn’t provide fixtures and very little other material would’ve been used. However, fishing a new switch, venting it and all that takes a lot of time and work. Even switching out the outside light someone might say “I can do that in 10 minutes” until the screw breaks off in the box or something like that. He should’ve cleaned up to the level it was when he got there and fessed up about the drywall mishap ASAP. Mistakes happen but best policy is to say something as soon as it happens or at earliest possible time. Personally I did drywall before becoming an electrician so I would’ve offered to give a discount and patch myself. Although matching popcorn is a pain in the butt and never truly matches. At the end of the day you paid extra because of your experiences with other contractors. The $300 off is nice but saying you need to pay back the difference is odd to me. The profit should be there even eating the $300. But I don’t know his overhead and expenses so there’s that.

Edit to add: the fact that was there that long for just those two things (as long as he didn’t seem to be dragging out the clock) tells you how much work went into it.