Bit Recommendations??? Please help!

i'm 15 years old and I own a 14.2, 11 year old quarter pony mare. My pony,Coco, has a strong head and is on the faster side. I've been using a kimberwick on her for a while and she loves it but kimberwicks are illegal in hunter shows. So i'm looking for a llegal bit for my pony that will control,slow-down,soften,etc. Any llegal bit suggestions???

P.S.: Please don't suggest or tell me to try super mild snaffles like plain jointed,rubber,etc. Yes, I've tried lessons and excercises to help control my pony from running through my hands but with a easy bit it just dosnt work without me half haulting every second.

PLEASE help me with reccomendations!!! Thank you!

I am not sure what is legal or not in Hunter cause I don't do it lol but my absolute favorite bit is a full cheek snaffle its not to harsh and I no many pro trainers that use them

Have you discussed this with your trainer/instructor?

I thought kimberwicks were legal, but considered unconventional. I believe a pelham is legal and quite common.

Pelham! Good leverage, good for a strong horse (so I've heard). Considering trying one for mine