You're not going to get much help with nonstandard builds like UIFX as they often have bugs above and beyond the standard MAME distribution.
I do have some good news for you, though. MAME 0.173 and later has greatly improved XInput support for those 360 pads, and you're definitely going to want to upgrade as soon as possible to take advantage of it.
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Try checking the MAME manual at http://docs.mamedev.org
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