I am running 3000F, 5000C, 1000B in my Rex XTM-1 same Spider gears this is for very tight short track bumpy mixed surface.
I will in time may change to 5000f, 7000C, 3000B. This setting better for open longer track smother surface.
I have tried 3000F, 10000C 1000B and buggy was right stuffed up hard to drive etc.

Your oil settings 50,000 front 70,000 center 30,000 rear all 4 wheels all most locked in 4x4 drive.