I would have to agree with everything you said. I used "A game" as a blanket statement for being better than the table. I probably just gave away my own skill level, subconsciously assuming my A game is needed to beat a table.

I would suggest OP look at his play history. If his usual play is to go up the first hour pretty good and then loose most of it back by the 10th hour, I would say that based on his average play his stop point is somewhere in the middle. If he goes up 1000 I would think he would set his departure point at whatever point he drops to say 800. OP is obviously looking at making a profit and is less concerned with felting the table by staying longer and taking a chance on losing everything he is up. Leaving the table early with more money than you started is better than leaving later with less.

As far as hitting and running, I have never done that but I personally wouldn't hold it against anyone. If someone sat down and dropped 500 in 5 minutes and left the table I don't think anyone would complain about it (well other than the obvious "damn why did he have to go so soon").

Sit at the table you have edge at, leave when you no longer have an edge.

Sometimes it can be a small thing that you need to take as a sign that you have lost your edge.

Someone with that issue doesn't have the mental chops for poker.

The underlying premise is that the A game here is good enough to beat the table. That underlying premise appears to be false.

OP insists he's playing his A game and expects to lose the more he plays.

This is golden advice.