My upper level show jumper has always had a habit of wanting to overcurl. Do you guys have any bit suggestions to help her?

I say just go in a western hackamore and teach her how to keep her head low
I agree with @bowenbrooke about the micklem
I would just use a simple snaffle bit, with no poll pressure and
A baucher bit or micklem bridle bother have no poll pressure.
Something with barely any pole pressure and simple
Cheltenham gag?
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