Trouble with HOTAS joystick buttons

[Hoddd9000]

I'm trying to use my X55 to play the game (fly spaceplanes, etc.), but I'm having trouble with the input mapping. If I map, say, view up to a hat switch on the joystick which is labeled "button 5", and toggle SAS to a switch on the throttle which is also labeled button 5, the two will interfere with each other. If I press the hat switch, the camera will move (as intended) but SAS will toggle, and vice versa. KSP is the only game I experience this issue in.

I'm also experiencing massive input lag when using the joystick, however mouse and keyboard are unaffected.

Does anyone have any ideas for workarounds/fixes to these issues? I found an old thread about the same issue but haven't found anything recent.