Greetings
Just have a question out of curiosity.
What is the difference as far as arducopter is concerned between x and h quads? It seems to me that since the motors are in the same relation to each other they would have the same control requirements
uh-oh , you asked that taboo question ! Tell us if you ever live to know 
Could it be that more torque is needed for pitch than roll?
Could it be that more torque is needed for pitch than roll?[/quote]
if it handles asymetric frames, yes, maybe even separate roll/pitch PIDs