Why don't you try with current limiter at min and max settings, it can't take too long to try it and if its the cause the difference should be obvious. But it does look like the speedo programming is as Neal describes, but did you do any programming on the speedo before using it as I thought Vampires cam with all motor power settings at full (max punch, timing advance and no current limiter) from the factory. Also are you using it on 1S or 2S?
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