I can be of no help! I learnt the wrong way - mummy sent me to a riding school to learn correctly but I never mastered the trot!!! despite the extortinate prices (in them days ten bob an hour) I left and when older went to a riding school that just hired out the horses (against mums wishes) with little or no instruction , The horse took off with me - galloped across a field following the others - jumped a small hedge with me hanging on for dear life - that was the day I learnt to ride - and had a last the perfect trot - gone was the bumperty bump! but whether I do it right or no I don't know I did have a saddle on that day but do tend to I grip with all my inner leg, maybe because I rode bare back much of that time so it's maybe its a bad habit thats stuck .
DT