Duck Soup Designs review for Printful: Print on Demand

The products are terrific. Anything I've managed to produce to completion has arrived top quality, on time, and looking fabulous. It's the design interface I can't figure out. I've wasted more time loading and reloading, deleting designs and starting over, sifting through help sections and not finding what I need to know - the online chat seems to be in a completely different time zone than I am. Today's dilemma has been a simple t-shirt design that will NOT let me add to store because the 'interior print has low contrast.' I have gone all the way back to redesign the actual graphic to bold the logo, in white, but it will not recognize that it's ok. There is no greater contrast that white on black! Which wouldn't be a problem if there was a bypass option. But there's not. I find the entire design interface to be cumbersome, slow as heck, and ambiguous. Compared to other online design platforms I've used (Vistaprint comes to mind), Printful's does not compare at all. I'm looking at options. Which is a shame because I really like the company and the products.