Sorry to read that...
About the handling, perhaps using Nickel batteries is part of the problem ? I have the same layout but use Lipos, and the front-rear balance is just an
about right. Maybe your heavy battery could cause too big of a front weight bias ? just suggesting. As for the 4 gear mod, I never ran mine without it, but those who have seem to agree that it makes a huge difference.
Good luck !
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