Digital BW, The Print

Hi everyone--
I just put the MIS VMS inkset cartridge into my 1270 and it's giving
me trouble. At first I thought it was something I was doing but now
I'm not so sure. Here is the 6 color purge pattern printed with my
sepia inks.
http://photolab.elmer.uaf.edu/tests/Purge6sepia.jpg
I looked at Paul Roark's step wedges in the Files section and his
inkset seems to be different. The magenta and yellow position inks are
not the same--my yellow is his magenta and he has a neutral in the
yellow position. I tried both Paul's and Keith's curves and the
stepwedges look pretty strange. Are there different VMS sets out there? 
Kim