Your second point is a particularly interesting one. Traditionally, a candidate gets a bump from their convention, VP pick, and, in this case, a failed assassination attempt (they get even better press if it's successful LOL).
I think an argument can be made that this IS Trump's high point. Biden had a poor debate, the convention happened, he had the maxi pad on his ear to emphasize how horrible he'd been treated, and he picked Vance.
He DID get something of a bump, but right on the heels of that, Biden stepped away (I still wonder if that wasn't orchestrated) and Harris immediately wiped out his gains and more. Her unfavorability went from -19 to -3 overnight and she still has room to grow. The Obamas just endorsed her, the convention is coming up, she's still got a running mate to pick.....hopefully a VP pick that goes over better than Vance.

That was one of the most bonehead moves I've ever seen.