I posted a video where you can see that my shots are pretty consistent, don't know if you saw it in my thread.
I tried the Tamiya Hyper Dash motors mentioned in another thread and the motors mentioned in this thread are significantly better for our Nerf use. The Tamiya motors seemed to have a higher RPM which would give a better first shot, but the follow up shots were absolute shit compared to these or even the stock motors.
Did you perhaps leave the thermistor in? That would make subsequent shots worse.
Any range measurements for these motors?