The equipment: I've used the same bit on my 27 year old Tb for about 8 years now, I keep it incredibly clean and it shows only slight signs of use. I have recently (within the past year) changed her bridle, however, and I'm worried I might have not set it exactly as my old one was.
The behavior: She's great about putting the bridle on, getting to the ring, getting on. We have no significant problems with stopping except that she's large a bit too forward moving sometimes and it takes her a while to get there. She's got a beautiful flex left, and her flex to the right has never been as good (I've been told many times horses often have a better side) we can get there but recently I've been noticing she tosses her head when I initially ask her for bend.
What I've done so far: I've watch TONS of bridle fitting videos, checked in my own books asked the barn folks, all say we're relatively correct, I've got two wrinkles in the corner of her mouth, no banging on her teeth that I know of... no issues on the left.... At the end of our rides I ask her to bend all the way till her nose almost touches my outstretched boot (apparently a good flexibility move and something I've done for years) and she resists more on the right than the left. This has not always been the case...
I'm stumped! Any ideas?