I shoot two Leaf A65's in the studio using either Schneider or Rodenstock digitars in the range of 100, 120 Macro, 135, 150 and 180. I use fairly severe tilts and I have to say, I have noticed little and mainly no colour casts.
I used to have a bit of centrefold when using one of the backs horizontally and I used the white disc provided, used the built in calibration within the program, created the gain file, which I then saved to be set as the default when shooting under a particular lens/tilt/orientation and the centrefold problem was sorted.
Mysteriously, I haven't had the centrefolf problem for quite a while anyway, ever since I swapped cameras to be assiged to different setups, so I now use the Leaf default all the time, but creating gain files is very easy. I doubt you will need to do it in any case.
Despite the slowless in coming up with updated software, I am overall a happy Leaf user, a rare occurance in this forum. I use the backs constantly and daily, not a problem. The files are very good indeed
Edward