Unless your Geared wrong? My C4.1 is a 6.5, I know people ran 4.5t up to 13.5t!!!. It didnt look slow but when you drive you can 'feel' it.
What were you runnig?.
Why not try a Turbo setting on the ESC?
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Vega RB6 - Orion - Apex Models - JE Models - Cable ties
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