Daft question, but have you checked the throttle EPA is set to 100% forward and back? When you're setting it on that radio it won't show percentage unless you move the trigger in that direction.
If you're not seeing the 100% throttle LED lit in forwards then something's not set right. When you do the ESC calibration it's neutral, full forward then full reverse.
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Back from 30 year retirement finding use for my thumbs again, slowly getting faster!
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