My alt just learned glyph of disease, and happily made one for my DK.
I'm now Blood 51/0/20, and the IT-PS-HS-HS-DS-DS-HS-HS-HS-HS rotation worked for me.
After I took the glyph and tried with dummy, I found that I screwed the rotation.
I begin the rotation with:
IT - PS - HS - HS - DS
DS - HS - HS - HS - Pe(with Death-Rune)
and then:
HS - HS - HS - HS - DS
DS - HS - HS - HS - Pe
HS - HS - HS - HS - DS
DS - HS - HS - HS - Pe
...
After some test, I found that the timing of Pestilence is very critical, and I have difficult keeping disease up with this rotation.
Did I missed something ? Or this glyph is not designed for single target, but for AoE ?
Any suggestion is appreciated.