If you have a complex stickl/throttle/rudder set you should connect it through a powered USB hub (for all sims).
I have a Saitex X-55 plus rudder - that is 3 seperate USB connections - perhaps you have similar. X-Plane instantly found all 11 axes no problem (4 rotaries, 2 throttles, 2 for stick and 3 for rudder/toe brakes).