haha yeah I'm not even that tall, yet I can make 15 hh horses look small. Maybe I just have long legs?
Anyway, thanks for the advice about saddle size, especially since I'm not that familiar with Western tack. I'm not sure of the exact size of his saddle, but it actually is pretty small and fits him well. The skirt in the back does reach his last rib, but it doesn't extend past it, and the seat itself is even shorter. And of course I always place his saddle farther back than I would an English saddle. :)