this probably won't relate to many (since the oddness of the setup)
but I use both an x45 and CH stick, and CH pedals. I use the x45 throttle only, the stick part just sits to the side of my monitor.
no matter what I try if all 3 are in the belkin hub the CH pedals go all flaky and spike all over. this is on multiple PC's too.
it only works if I put the CH stick and pedals into the PC directly, then mouse, keyboard, x45 in the belkin hub.
just a tip in case you have some odd spiking problem.