Dual jets are awsome out of the hole but suffer top end. What if you had one jet pump with two inline impellers? The first could move a lot of water a slower speed (shallow blades) and the secondary could move a smaller amount of water a greater speed. You would have to fabricate a bowl sized pipe to extend one impeller from the other. May need a boost relief valve? Should help more on the holeshot than at top speed as there is already suction pressure at greater speeds.