If it were me, I would be chasing the Vuescan guy.
From my past experience, support from him is almost zero. You could always try :-\
Terry.
Vuescan and scanner profiling are at odds it seems. I've seen numerous discussions on various photo forums about Vuescan profiling and how it never works. My own experience was that after profiling my Canscan 2710 film scanner with a Wolf Faust IT8 trannie target, my scans had a slight magenta cast.
After reading more about PP, I'm wondering if it will allow me to profile my film scanner as it does seem very biased towards flatbed scanners.