Thanks for the tips and knowledge. I did some testing of my own, and it might be my lack of experience with the rotation and my lack of gear. In my testing though I found DC with having Glyph of Dark Death on average did around 10% of my dmg while DRW did roughly 7%. Kind of curious it is a like opposite of yours but like I said that is probably from you having better gear and better rotation muscle memory.
I also did the test with both 1/2 in Epidemic and 2/2 in it, and found the dmg was very similar over the span of roughly 3 mins on a target dummy. The management of disease though I thought was much better with 2/2. (This is while using DD glyph)