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I'm assuming this is for the ESRA IREC/Spaceport America Cup competition. What school are your from?
Under-filling an M hybrid to get from 25K to 10K will not work under the stability margin requirements and thrust-to-weight minimum. It might also disqualify you from the "COTS" motor category. If this is for the student-built motor category, starting with a Contrail motor will probably disqualify you. But, I bet nobody will check any of that.
No test flight is required for IREC. No experience needed. An experienced mentor isn't required. These (among other reasons) are why I didn't go last year and won't be there this year even though I live nearby.
I understand the COTs thing, but underfilling a hybrid should not affect the thrust at all (or minimally), it will just affect the burn time I think. If you reduce the tank volume the liquid pressure is unchanged.