8t 1.0 brushless motor kv?

[medusa'd maxx]

wondering if anyone is having sucess with a medusa in an 8t
Im wondering whether an 80 mm can is overkill I will be running 4 or 5s through a mmm and want to hit 40mph. I also want to run as cool as possible
as I have high ambient temperatures year round 100f + in summer, I also run on grass a lot any help would be appreciated