I would say the UV/IR cut is not supplying much, oddly and unfortunately it could be simply supplying the light pollution that the L-Pro removed, or should remove. The L-Pro cuts UV and IR much the same as a UV/IR cut does.
The L-Pro is the "useful" one, it is passing from Blue to Red and hopefully cutting out Na and Hg light pollution,
The L-Extreme is a fairly narrow 2 wavelength pass at the OIII and the Ha peaks.
So I would say:
The UV/IR cut is in effect doing or adding nothing other then adding the LP that the other 2 remove. In effect somewhat negative.
The L-Pro is the one collecting "most" of your color while managing to still remove the Na and Hg light pollution.
The L-Enhance is just collecting extra OIII and Ha to add to the final result/stack, if wanted.
I would remove the UV/IR component,
Stack the L-Pro, and for extra OIII and Ha add the L-Enhance to the stack.