She used to be a pig about her headset, and it seemed that if I wanted it level, that meant she could stretch out and run, and if I wanted her to stretch down, she could fall on her forehand. Drove. Me. Nuts. My posture was terrible because her back was hollowed out all the time, resting and in exercise, due to that untreated arthritis back then, so all this is like starting fresh two months ago. I became a defensive rider because asking her to do something reasonable was painful for her and she would respond as such. I really got confused, I'm still getting un-tangled so I can think straight on her.
So, now the bit evasion is limited to that walk issue. About last month she would over-flex behind the vertical if I kept at her when she raised her nose, now she's starting to understand that it isn't going to hurt her like it used to. She either stays on the vertical now when I ask or gradually tries to sneak her nose up. Just today we would be going along and if I did something right I would look to my trainer to say something about it, and Velvet would dead stop, feeling just that much a hole in my attention is enough for her to make her own decision. We've a **** good turn now, though, I can get her to really step under and flex her whole body without slopping her shoulder.
I use a neck stretcher on her sometimes, mostly without a rider on her, to help get her in position. She has no problem getting a powerful thrust from behind, the thorn lies in trapping the energy. Most of the time my trainer tells me to slow my posts during rising trot because she gets a "big girl" trot where the energy is just blowing straight to the forehand. I'm guilty for letting her get a forehandy working trot when we ride on our own, I tend to not want to bother her and let her do what she feels is cozy. It's my homework now to replace our working trot farts with medium trot sessions.