Recumbent trike setup help

I ride a recumbent trike, a Trident Spike with 20” wheels, and have it on a SportCrafters Overdrive trainer. I have a Coospo ANT+ speed sensor on the hub of the drive wheel. My on screen speed is not matching what I expect from my efforts, no matter what gear I have the trike in. I’m having a hard time even getting it to register more than 1-2 mph on a flat when I would expect 8-12 mph. What adjustments can I make? Riding at barely walking speed is no fun.

Increasing the reported wheel size means more distance per revolution

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