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Originally Posted by mechanicalbrain
FIRST's double wheel design is really bad for turning.
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Aaaaaactually...
It turns fine, when used correctly. I'm curious what exactly you're talking about? Perhaps you could give us some clarification or justification?
Back to the problem at hand...
You mention adding traction to the wheels; this leads me to hypothesize that the added scrub friction during turning has now overcome your turning moment.
The symptoms you describe, also make me believe that you may have a low battery. (Low battery = less motor torque = less turning moment). When was it last charged? (I'm just speculating here...)
If the battery is charged after all and the problem persists; cover the tread on 2 of the wheels (rear or front) with duct tape and see if that helps. If so, your problem is as I described above.
There are many solutions for this ranging from quick and dirty to elegant and expensive.
Good Luck,
John