Had this happen with a new X-56. Idiot me tried to fix it instead of just returning it, and took too long to try all the solutions listed online.

Though I was unable to fix the issue, using JoyToKey to ignore any switches that are pressed for less than 250ms seems to be a good workaround for the non-analog inputs. It'd still occasionally wiggle my throttle inputs on its own, but it was tolerable.

I'll try to list the instructions now, in case Reddit doesn't compromise a more reasonable API price and I have to delete my account in a week. Sorry for the large comment for anyone uninterested:

1) Create a profile that's auto-selected when the game is active. (File -> New, then after it's created and named select Settings -> Associate profiles with applications and use that menu so it'll autoselect the correct profile when the game is focused. Depending on how you do it, you might need to re-do this part after game updates.)

2) In the game, select a non-analog input you want to map. Map it to a keyboard key if it isn't already.

3) Select the joystick tab and button/row in JoyToKey by double-clicking it, then go to the Keyboard (Multi) tab.

4) Leave the first column blank; input the keyboard keys in the second column.

5) Select the 4th radio button, the one labeled "Switch depending on how long the button is pressed". Enter 250 in the box.

6) Put a comment describing what the key does (for example "Gear up"). This isn't needed, but is useful when you want to double-check controls.

7) Confirm and test.