There's a lot of biting threads on here. But long story short, biting IMO is the one time it's ok to punch him straight in the mouth. Put on gloves if you know it's coming and you're soft skinned. He bites, he gets hit. But this will only work if you can follow through and go full out on him.
As for the mounting issue, I've had success with taking time. Saddling up, never get on. Saddle and just sit. Saddle sit ride then the next day, saddle and sit. I'll throw a saddle on as they eat while tied. Then take it off and cut em loose. Short rides, till they get in better shape. But mounting then making them stand us probly the best thing I've used for horses who won't stand to be mounted.
Also a lot of this can be straightened out in hand, which would be my preferred method. Ground manners go a long way towards riding.
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