MLs hulls have also been improved over the Frank plans, the running surfaces have been redesigned to take into account todays more powerful setups.
There is too much lift in the older hulls from when the boats were designed to run much lower speeds on heavier batteries and brushed motors.
More modern designs have different angles on the sponsons and different angles in the air trap section of the hull to lower lift and help prevent blow overs at the speeds we're running.