My first thought would be that the spin pole is too short on the boat that is burying.
Next I would look at mast rake (WAG 0 to 1 ft aft) and the look for water in the hulls.
Finally I would try to take both boats side by side and if one was still burying, I would swap spins to see if that was it.
The torque from the spin in winds over 10 knots is pretty big in comparison to the torque from the bouyancy at the bows for boat under ~20 ft. So, in general the spin is set to lift the bows. The longer the spin pole, the qreater the lever arm to torque the bows up and the greater the percentage of the force of the spin force that goes into lift.
This even works on boat that have no bows like Waves.
