t-Jet 2

I have been using the t-jet2 for about 3 months now and i am getting great prints. The only question I have out there for you fellow t-jetters is this. When I print (mostly only on dark shirts) The fuzz of the shirt makes my whites show up with almost a 'grainy' look to it. I have tried pretreating with wax paper first and even shaving the shirt. If any one else has run into this problem and has any tips, it would help alot. Thanks.

-love general clothing