Best thing you can do if you like the car would be to switch the motor to the left side. Such a car with motor on the right side will spin out way easier.
Been there, done that, night and day difference.
In the meantime try to gain rear traction as much as possible on low grip, longer links, shorter wheelbase, a nice smooth carbide diff quite loose, slipper slipping before the diff but not much. You could work on rear toe (go to 3.5 or 4, I even run 5 on an Xray XB4 2wd) and remove some antisquat (try to run with no shims under the FR. block)
On wet astro I was running 20wt oil on the rear with black springs (smallbore) or even Bigbores.
Try a full gurney wing, whatever you could to help traction.
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