At least you're 6'3" .
I'm 5'6" :_(
Haha but seriously, start with 95, go down all the way (at least a few inches below parallel) then start slowly adding weight. The 185 n 225 was eye raising.
Also, leg curls-make sure you're not heaving the weight up, focus only on hamstrings bringing weight up.
He needs to be doing stiff leg deads not pussing around with leg curls IMO.