[QUOTE=3rottenponies;8568326]
A tiny bit won’t necessarily be a bad thing. I primarily ride (smaller, with some exceptions)Arabs and ponies, and not only do they obviously need a bit of shorter length, but some of their mouths can’t handle the thicker bits. Oftentimes there just isn’t enough space for the things to sit comfortably. Would I stick my Hanoverian cross in a 12mm bit? Heck no, I would probably never be able to get his nose off of his chest. But some of the smaller mouthed horses do go around quite happily in a thinner bit.[/QUOTE]
I understand your point but the OP said her horse was really sensitive and light in the mouth. My mare also have a fat tongue and a low palate but still prefer the ‘‘wider’’ surface of contact a thicker bit will provide.
It is this part of the OP that made me think a fatter bit would probably be a better choice. [QUOTE=Keg-A-Bacchus;8567693]She’s extremely light in the contact and aside from needing to communicate a bend or flexion here or there I hardly use my reins and she’s in lovely self-carriage. [/QUOTE]
Reading it again also makes me think that the OP’s problem is maybe not related to bits in general but more about her horse accepting a real CONSISTENT contact.
Me think the horse is not at all in self-carriage but in a false frame. The OP’s horse is just avoiding any type of contact from the bit since it is only given/taken here and there.
THIS IS OF COURSE JUST AN ASSUMPTION, I HAVEN’T SEEN THE OP’S HORSE! 