Maybe your perception is too slow to notice the lag?
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Also worth mentioning is that the lag is common for several of the popular pinball games. It's not limited to FX2. It's just that pinball and fighting games (which I personally don't like) are two of the most sensitive to input lag.
Any idea of how much lag we are talking about? Personally I've played this pinball series of games and noticed a huge difference in lag between 1) a wireless keyboard, and 2) a wired logitech gamepad.
You seem to lump the lag together regardless of whether it's wired or wireless, and that raises a red flag to me that perhaps your lag is *NOT* from the input controller, but something else that is sort of a lag "bottleneck" and creates the illusion that you see the same lag whether wired or wireless. Maybe it's something with the display? I dunno, I just found the game was almost unplayable with wireless keyboard lag, but was near instantaneous with a wired gamepad.
Perhaps your display is using some fancy image processing, like how some TVs will perform certain image processing that adds lag? Try turning that off so your display is more responsive, then you might see differences in lag between wired/wireless controller inputs (which I'm guessing might be masked by your display lag if you have some extra display processing going on).