Since you are relatively new to RC-Boating, I think you would be better off to run 6s with a 1500kv motor.
I don't have the boat and can't tell you if the size of a 4082 motor is practical or not, but for a 2000kv motor of that size to run 6s, you will have issues to deal with . I don't know the Dynimite 2000kv/6 pole motor either, but again, kv too high for 6s especially you just want to enjoy your boat right now.
Hobbywing Seaking 180A ESC is a very good unit. If room would permit, and since you are spending money to upgrade, why not get this and you don't need to look for another one . it is always good to have head room in the Amp rating .
V2 turn fins for sure.
Dual rudder---
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