A bit underfilled is definitely better than overfilled.
Are you just applying throttle from closed without working the clutch to smooth out the power delivery? If so, that's your issue. These bikes...
Sorry for the late reply. It sounds beastly, even with the baffles. Like a muscle car. I couldn't tell you if it affected power, but my MPGs...
I just installed the same pipes yesterday and there should be no issue, as they take up much less space in every direction than the stock pipes.
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