Me too, jeez. I’d hate to be some of these horses, always being micromanaged/on contact. No one goes for a la-dee-da type canter through the woods? “Road trots” down a nice flat lane, light contact but not “on the bit”?
OP, does your horse have a rock-solid voice cue on the lunge? Personally that’s where I’d start. Then get in the saddle. Something in your seat/hands is aggravating him, so forego it and ask him for the canter strictly off voice (but be ready to back it up). Lots of praise when he does it.
Maybe he’s used to being micromanaged. Try getting the canter, then floating him the reins. Use your seat to control the speed/tempo. Try and get the downward with just your seat (and voice if needed).
I seriously think people need a mix of english and western riding to get a truly well rounded horse. Wenglish. Enstern. There’s no reason why we need to ride on contact every.single.second of every.single.ride. The hot sensitive ones need the reins floated and self regulation taught the MOST.