Don't focus on the head, take a whole horse approach. If you get true collection and working under himself the headset will follow as an afterthought. If you focus on just getting a lower headset the rest of the picture will suffer.
I wish that qualifying was still a requirement for 4-h here, it used to be top 10% and for sms a regional win to compete. The change to opening it up has sadly destroyed the level of competition. Went with a student last year and it was a glorified schooling show.
Good luck and don't stress too much. If you've done well enough to qualify there was a reason for it. Be sure to let us know how it goes! :)
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