Ok, guys. I went through all possible variations and no change. Changes pci slots etc....the numbering stayed the same all the time. Although i had two rev.1.9 cards in and they were numbered 1 & 2, always when installing the 1.4 card it became nr.1.
So, in the end i just decided to use MFII with 1.4.
One funny thing is that MFI's have some weird noise in the unbalanced headphone/line out channels. Its linked to graphical activity. I was thinking it has something to do with having too little power....and yes, It disappears completely with ext. PSU!!! So, i decided to use ext PSU on all MF's and it makes the noise floor slightly better on all channels which is no wonder as there is 1A power and the audio in the same cable. Very recommended.
I also use word clock to sync them although i'm not completely sury if it is necessary as there reads that cards nr. 2 & 3 get their time code from card 1.?!
With 3x MF with word clock and ext. PSU's this setup is amazinly good sounding 30 analog out/ 24 analog in setup.
Actually I assume that the numbering problem is because once Windows has decided the order of the cards it stays the same no matter what. So to fix this i'm guessing that registry might be the target....