I think the general problem with all synths organ soubds is that the quality is too good. I personally started running organ patches through a phaser & tube amp with a distorion channel and found just using the stock waveform with external effect processing creates a more accurate and realistic sound. I think the leslie simulation is the problem with most synths, and unless you come up with an accurate work around the organ patches just won't cut it on their own-IMHO.