The Warpath → Cyclone of War is intermittently working. Originally I put 3 points into it and it did raise my base crit chance by 6%. After that I switched back to more flat damage.
I was trying something different and unspec’ed a few flat void damage points and put one point into Cyclone of War, and my base crit chance went from 6% to 6%, with one point which should have made it 8%, but it stayed at 6%, but when I put 3 points into it- it went from 6% to 12%.