How are the Rx8 & T8's holding up?

[Marvin]

I was running an XB808, weighing in at 3.7kg.

Motor: Tekin T8 1700kV Buggy
Battery pack: Hyperion VX 35C 5500mAh 5S
Gearing: 42T spur, 15T pinion, 4.3:1 in the diffs.
Connectors: Direct solder between the motor and ESC, 6.5mm gold tubes between the battery and ESC.

The track is medium-large, with a few sweeping corners. EDIT: It is mainly dirt, dry and dusty - low grip. /EDIT

I use Mike's motor mount and one of his 15T pinions. In fact, the combo was bought from him at the same time as the motor mount and pinion.

EDIT:
ESC settings:
Punch Control: 60% (I believe it's around that mark. I set it to 70% on my hotwire, then lent it to someone else, so reduced it by 2 LEDs on the ESC)
Timing: 0
Cutoff: 5S
Throttle Curve: Linear

I haven't touched the other settings if I remember correctly.