I have the same results if I wear my Columbia rain shell rather than my Running Room running shell. The running shell doesn't pretend to be waterproof or windproof, - merely water resistant and wind resistant which I find to be good enough for winter. Rain isn't usually a problem.

It also has pit zips but I typically leave then closed in the winter. Today it was -9 F and I was comfortable with my Sugoi base layer and Old Nave fleece pullover. I was also wearing my Amfib bibs which cover part of my torso as well.

I don't think I sweat anymore with the rain shell, just that it doesn't vent as well. I wonder if you're having the same problem your jacket.