Originally Posted by Gleek
I've had about 10 years solid experience. He can jump at least 90cm.
He jumps this height when free jumping or with a person? If he not tucking or is he kicking out behind? 2 different issues. You also do not say if your experience is with jumping or another discipline? Do you have an instructor to make sure your position is correct so as not to put the horse off balance?
It is really hard to help you with so little information. Maybe pictures? And just FYI-there are plenty of QH's who jump just fine, so I doubt the issue is the horse. It may be training, but if he jumps 90 cm, I am thinking the issue is the rider or training or a combination of those 2.