To answer the OP’s questions:
#1 - yes, running the 6S setup will pull significantly fewer amps. If you are not constrained by racing rules running 6S is a good idea. I have run several of my 4S boats on 8S1P instead of on 4S2P, using a motor with a Kv around 900-1000. With the same weight I get the same run time and speed with half the amp draw.
#2 - the 42/66 lifter prop is probably okay as long as the boat doesn’t drag its transom much. Remember that the “stated watts” for a motor is just a guide for a safe range, believe me it is possible to pull way more than 90 amps from that motor. Many racers pull in excess of 100 amps from the smaller 36-56 RTR motors.
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