the best advice i can give you is print BLACK INK instead of white. The red shades and darker colors HATE white ink.
especially the color brick.
run them through the dryer first to get some of that dye to evaporate first, or it'll make it's way up through and into your white ink.
also - they can migrate in the box up to 3 hours later, so watch out for that. They can look GREAT at the end of your dryer and look terrible at time of delivery.
other than that, they are a piece of cake! We hate those shirts. I mean, we REALLY hate those shirts. Not bad if printing dark on light though.
J