I'll throw one in from left field. Change 10U, 12U, 14U, and 16U to 9U, 11U, 13U, and 15U. Keep 18U as it is since there not much difference between a 16 y.o. and an 18 y.o. Let 13's pitch from 40' and 15's from 43'. Seems to solve the HS problem.