Well, the tension of the spring could be the issue. I'd start by adjusting the left, because thats what seems to be the problem. And it could just be that you haven't built up the technique yet. Just start slow, with 8th notes, and gradually build up, being sure to keep the rolls even. Some days i have the same problem. I'd say just experiment with different tensions on the pedal.
Hope this helps,
ZK
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