LOL.. I didn't put the exclamation point there. I am guilty of the question marks....

Hi, noob here. Just started mining after finally got my hand on the XFX Vega 64.
I am currently only using a single Vega 64 (as they are hard to find at MSRP) plugged in directly to the mobo Pcie 3.0 16x.
I am currently getting a stable hashrate of 44.166 Mh/s at 59 degrees celcius. Total wall power (card only) @ 230W.
My wattman settings are GPU - state 7 min/max 900, Memory - state 7 at 1100 / voltage control at 1000,
CPU speed set to 1000 - 3500, temp setting between from 60 - 75, and power limit at -20%.
My questions are:
 1. Is this a stupid setup where I can damage the GPU way sooner before I get my ROI?
 2. Is it worth the investment to watercooled the GPU? will I get more hashrate out of it because of cooler operation?
 3. Will I be able to mix it with additional vega frontier edition?

THank you in advance