TFL Zonda Maiden Voyage

[OHLP]

Hello all, new to the forum and somewhat new to RC boating. I started with the purchase of two used Traxxas boats (Spartan and M41) and quickly realized I wanted something better. I ran across a new in the box RTR TFL Zonda (the blue and white one) that I think was a pretty good deal. I need some advice about what I need to do to this boat before the maiden voyage. It has the 120A Seaking ESC's and 2075 kv SSS motors that will be powered by two 4s 5000mah batteries for now. Here's my questions and any additional input would be greatly appreciated.

The shafts need to be greased and the manual doesn't say what to use. What kind of grease? Will regular axle/bearing grease work?
It came with XT60 battery connectors. Are these sufficient or should they be upgraded to XT90 or something else?
Does the boat need to be reinforced? I've read on here that a lot of boats do. I have no clue how to do that.

Any other suggestions would be greatly appreciated. Thanks!

This post may be in the wrong place, if so mods please move to correct.