Honeycomb Bravo & SPAD.neXt - TriStar throttle lever resets to idle when physical lever not moving

I decided to try setting up controls for the TriStar using my Honeycomb Bravo in SPAD.neXt instead of using the sim's built-in bindings, and I've run into a bit of a problem: the throttle lever in the TriStar's cockpit resets to zero (idle thrust) when the physical lever on my Bravo isn't actively moving. See this video: https://drive.google.com/file/d/1U7UFaQO1-VXJzfFhl_SA5pK43_ZUKs3R/view?usp=drive_link

This is basically the last obstacle I have to cross in order to have all my controls for this aircraft in SPAD instead of the sim settings (I don't like needing to have settings for the same thing in two different places at the same time). I don't know if this is an aircraft bug or a skill issue on my part, but I'm leaning toward the former, as I've tried all the SPAD thrust lever bindings I can find, and they either don't work at all or exhibit the above behavior. If there's any other information I'd need to provide in order to troubleshoot this, please let me know.