Another 5'2 signing in...
I wear 8" as well and feel much more comfy in them. I've worn and loved the Sugoi Evolutions and am currently rotating two pairs of PI Microsensors. I have a pair of 6" but I prefer to be more covered up when riding outside. I think the 10" may be a bit long. My 8" currently leave about 2-3 inches of coverage so imagine the 10" would reach your knees.
I'm not sure I buy the muscle support bit. As long as your shorts do a good job of wicking and you pick the length you feel most comfy with, then go for it!
All limits are self imposed - Icarus