Hi Gary,
Do you use two sets of chisels, one for paring and one for chopping? I have two sets but always default to using my nice Lie-Nielsens for both. Thus, when I start to pare dovetails, the chisel is in need of sharpening because I've just used it to chop all the tails and pins in oak or ipe. The sad result is that my frenetic forward momentum is dissipated into the ether (hopefully charging up some woodworking somewhere else).
As a side note, the little trick you showed us in your joinery class of creating a little bevel at the scribe line before paring has made a world of difference in my ability to cut dovetails. I no longer whack at it like H. neanderthalensis with a pointy rock. Next thing you know I'll be walking bipedal.
Cheers,
Steve Warburton (again)