Digital BW, The Print

I have tried to find info on banding problems that I am having but have not
been successful. I have a 7000 with MIS FS inks and imageprint rip. I just
starting getting these using current setup. Today did a print on photorag
and had banding, did to cleaning cycles and used EAM and looked good. Went
back to photorag and back came the bands. They are very slight but I can see
them. At 8x it looks as if one of the inks is not squirting. These are
horizontal bands. My studio is 90deg plus with high humidity ( only use ac
when I am working)so that might be a cause.? Thanks for any help.
Bill Giffen