Once I used clear scotch tape (Christmas wrapping tape) to close up the holes on a vented two blade that hissed when flying through the air. Worked like a charm.
I bet you could do the same with the woodsman to make the vented blades "solid" If you close up the holes, they won't hiss!
Minimal investment, won't change the weight very much at all, and will not affect the performance while cutting through tissue. I actually don't know if that last one is true or not, but I can't see it making a huge negative impact.
Use a razor blade or exacto knife to remove the tape on the solid areas. That minimized the actualy amount of tape used ... just covering the vents.