Hey guys, the boat showed up today and looks good. I had to adjust the water pick up and the strut. I have a few questions.

Regarding batteries, is lighter better, or is the weight needed to keep it balanced at speed?
I see it runs on two 2s lipo's. I don't have any. Can I just cut the series harness off the esc and just parallel my two 4s lipo's?
On 4s, which prop will give the most mph without cooking everything?
And last question for now, do any of the stock components have to be upgraded immediately?