DB01 electrical/gear setting issue

Hi All Brothers,

I am having issues with my DB01, please help:
Background:
battery: 4000 25C 2S
with Slipper control:
Setting 1) 9T with 17/91; the slipper and motor get very hot after about 10 minutes; the ESC is not hot at all.
Setting 2) 23T with 23/91; same as above,
Setting 3)  23T with 19/91; same as above,

Is there anything that I can do on the setting other  than adding heat sink?

Thanks in advance

  Anyone can help please

是否齒比太大,或者傳動系統上有阻力.
但正常狀態下都有一定的熱量

3# turbines

傳動系統上有阻力?  Does it mean on the belts?  please tell me more,  checked the rear diff, and front one-way are ok.....
I understand that there should be some heat involved, however, the heat shielding plastic that came with the car melt    My Lipo also get heated from this.....

check both belt tessions.. and try 17pioion or below / 91s  gear.

5# Angtr

Thank you for your advise, I will try to get a belt tensioner and see what happen...