Rob, I will try to give you a call over the weekend to talk it all through with you. My RB5 has awesome stability and although there is a little torque reaction on throttle (all rear motor 2wds do have a bit, RB5 is actually better than most ... SP2 better than stock RB5 due to central motor)
Sounds to me like a combination of several things but start by checking droop is even side to side (RB5 is VERY sensitive to droop balance as the chassis is so stiff) and that nothing is binding. As for the gearing I run my SP V3.0 8.5R on a 27 ro 28 tooth pinion!
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