Motor running to hot, not sure what to make of it

[Ola]

Today i got my new max paddle tires, and had to test them in snow..

i`m running XXL drivetrain, a Tekin RX8/T8 2000kv on 5s, geared for 43mph on these tires.
Temp is approx -1 celcius (30f) outside.

I was driving on a field of snow, hardpacked with 3-5cm on top. Very good traction, wheelied like no tomorrow, almost flipped on throttle..
Did some high speed running, alot of accelleration. No jumping and slo-mo, so it got a hard run so to say..

After 10min, i read temps.. RX8 was 50dg C (122f), ant T8 was reading 75-85dg C (185f) (!) based on where i measured, but all reading was done on the rear plate of motor..
Definitive hottest on top, where the motor cables are soldered...

Since i`ve never run this motor setup this hard ( i mostly bash/jump, never speed run), i have to ask for some opinions..
Am i way out of my league, running this motor on 5s?
Or is it undergeared, since the RX8 isnt nearly as hot as the motor?