You sure it only has 12? That would mean each phase only has 4 FETs, only half of which are on at any one time (per coil end). The 80A has 18 FETs, 6 for each phase and 3 on (per coil end) at any one time. Granted, the 80A uses a different FET package, but the specs aren't
that good on the 4833's... I would have thought the 150 would place FETs on both sides of the power board.