why are my temps so high???

[Finnster]

The big part of the problem is you are running monsterous power. A 1Y on 6S, I'm sure you are seeing 2500-3000W+, esp if you are running 40series tires (IDK.)

HUUUUUUUGGGGEEE power.

Even @90% odd efficiency, that's still as much as 300W of waste heat. That's a ton. You need to:
A.) Bring power down w/o killing eff%
B.) Get a more eff motor/setup
and/or
C.) Get a motor that can dissipate more heat

Perhaps a 1521 may be more appropriate for what you are wanting to do. Drop the kvs a lot and have a bigger can to withstand more heat. Ups eff% too. Do you really need/want all that power?

If you can bring eff up several %, you can run that much more power w/o the waste heat. Combine that for w/ a bigger can for a much cooler setup.

Else drop power into the 1700-2200W range where the 1515s are much better suited for.

What is your goal?