If you aren't intending on using AutoWake I'd still put 250-300 under the bow and the other 200-250 midship or surf side and see which throws the best.
We generally have a small crew so we manually fill everything 100%, then turn on AutoWake to achieve static presets and see if we are in the general vicinity of pitch & roll. Most of the time we just leave it on but sometimes we use without.
I have Enzo's and 500lbs of lead....I may snag another 200lbs when I pick up my PWT tickets from my dealer 
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2017 Moomba Craz Surf Edition
Flow 2.0 Surf System w/ AutoWake™
5,600 Lbs Ballast - Enzos + Lead + Sumo
Wet Sounds REV10s + REVO12-XXX