Ok I have some insight on my problem, it was not the fault of MAME Plus! rather a code edit I did to the NeoGeo driver. I was trying to eliminate the slowdown that plagues heavily on some games ( e.g. the Metal Slug series), so I had upped the main CPU from 12Mhz to 30Mhz, that fixed it BUT as I posted messed up some games. Oddly enough the solution was to create the nvram on an unedited 0.148 exe (Plus! or normal) and then run again on the overclocked exe.
As for the filters, I specially like the HQXS series (HQ2X, HQ2XS, HQ3X, HQ3XS, etc) that are common in emulators that handles 2D displays. There is a whole world of difference between the standard bilinear filter that comes with the normal MAME.
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