QTR-Quadtone RIP

I am doing my first tests on enhanced matte, using the appropriate QTR profile.
My images, using both bilateral and unilateral printing, at 1440 have subtle lines as often 
seen when printing for speed instead of quality. The same images look fine if not using 
the rip with the "speed" box unchecked using Photoshop CS.

I donot see any place to adjust the print quality or speed in the QTR "print" window...other 
than choosing bilateral or unilateral.

Thanks so much
Celeste