[SunnyHouTX]

Standard MM with no mods except for the external CC BEC and red wire from RX lead taken out.

Have you installed the Castle Link software already?

If you have, plug the USB cord to the MM and start the Castle Link software. On the Basic tab there is a part where it lets you set "Cutoff Voltage" to "No Cutoff". Also, as a precaution, set punch control to 100% and motor timing to "lowest".