ZWO flats banding question


I’m using 76/15 for LRGB imaging (Gain/offset) , and when I use that same gain/offset with Flats Wizard seqeuence, I’m getting banding on my flats (0.7-4 sec)
For Ha and O3, I’ve cranked up my aritficial light box and there are no issues at 139/75.

Any ideas how to eliminate those?

Also, is there any way to increase the iterations on the Wizard beyond 10? It sometimes seems to swing exposure amounts so it times out after 10 iterations.