My gelding just started coming back into work after health issues (heart and hind splint) and while I'm much happier about his temperment this year and willingness to move off my leg - the bugger evades the bit by ducking behind the vertical. I ride in a crank noseband and eggbutt snaffle and have loosened the crank (which I mention because it's new this year for him, versus his old regular cavesson). He is also shaking his neck a lot during and after the ride, which he's never done.
Now before everyone says push him into the contact and drive his impulsion. It's not working. He has impulsion in excess! I use demi-arrets to some help. I've decided to ride him long and low with light contact, which he'll do, for the time being before my next lesson (also first lesson of the season).
He does have a stiff right neck (has for a year since I got him) and find he ducks behind the vertical 'mostly' in bends that ask him to stretch and round his muscles. So I do carrot stretches, give him a message before and after the ride and always cold rub water/linament after the ride.
Any advice or suggestions?