Any tips to print 65%poli-35%cotton sweaters with kornit breeze?

I'm printing without problems on 100% cotton (or 80%cotton-20%poli) sweaters, but I now have to print a stock of 65%poli-35%cotton sweaters. I'm printing with a breeze and new sotfware 2.0 but I'm still nowhere near satisfaction as the prints are not good at all, even with double white. I was wondering if someone solved this problem using the new delay option. (and how!)