does he pace? get your walk and trot collected, get on the correct bend, you too (even exagerate onto a revers) and ask. get your lower paces sorted before upping. if you've alrrady got them. do from walk to canter ) it's usuallly easier for horses).
also does he stike off correctly on hacks?
also lunge off voice and transfer to ridden.
? where is your weight?