Weight transfer front to rear when on throttle is controlled by front droop. The more front droop you have, the more weight transfers from front to back on throttle. This gives you an on throttle understeer (front gets lighter, rear gets heavier) and better rear grip... when on throttle .

It is reversed in off throttle. More rear droop allows weight to transfer from rear to front when off throttle or braking. This leads to a heavy front and light rear. The effect is more steering (oversteer) and faster rotation (rear is unweighted and light).

The rear motor does cause a pendulum effect which may confuse the droop setting. It may seem like the lack of rear droop causes the spin outs, but it's mostly because the weight of the rear motor wants to keep the rear turning even when you want to go straight... grip issue...

m chassis tuning is always a little weird. Short arms, high profile tires (if you use tamiya 60d)... best if you just try it

Best if you try it and see what you need.