Thank you for your responses. I haven't used this exact combo but I have used the Rutile paint on glaze with this clay with a lot of success. This situation has occurred when I switched to the powdered/dip glaze. After reaching out to Amaco they suggested that instead of doing two layers (dip, let dry, dip, let dry) - that I'd be better off with dipping once and holding it in the glaze longer to achieve a better result. They suggested that the 2nd layer didn't grip the clay body well enough because it was over the first layer.
The firing was a fairly slow Cone 6. About 8.5 hrs to fire. The insides of the ware were for the most part unaffected - the outsides we definitely worse. Pieces from all different levels in the kilns were affected. There didn't seem to be much a difference between higher vs lower shelves.
There was no noticeable cracking in the glaze and hands were clean prior to glazing.
Thanks for everyone's feedback!