Tapered stroke lines print much thicker than uniform strokes

I've recenly been playing with the Width Tool to make some illustrations look a little less computer generated. I'm tapering the ends and using a few stroke styles rather than the standard "uniform" strokes. Onscreen, the lines are exactly the same thickness as my previous illustrations. But, when I print to my laser jet, any non-Uniform strokes print twice the thickness. Is this is glitch or am I mssing a setting? Uniform strokes print perfect, anything else prints thick.

Attched hopfully is a pic...