I am by no means the most clever person here but I can see few flaws with the boat that you have, given the link to the addvertisment.
Overuse of the word professional is a give-away to a nqd type build.
A single prop and "vector thrust" do not go together.....do some reading and all will become clear.
A single 550 and 35 mph+ is a long shot for a boat that is over a metre long....reaL long shot !
35 min run time with a 3600mAh pack on a 550 for FE is a non starter !!! End of !!

o.k so I have bagged the add for the boat that you have bought, all is not lost.
I have bought a few different boats over the past year and have learnt a LOT.....from the people here and on the Red, and Blue boards.

Run this boat as is and enjoy it for now.
Possible speed increases are made by.
Faster motor = $$
A better prop
More cells............Hmmm more power can be addictive.

A combination of all 3.

Welcome to the world of modifying low cost boats. I have not been there and done that, I AM there and am DOING that !!

Cheers, Simon.