Frost DK Rotation Please Help!

Guys I'm asking for help, I read Gnimo's Frost DK Guide and Practice different Rotations in there but I always failed to refresh my Diseases using Pestilence on the 3rd part of the Rotation (The 3rd Pestilence).My diseases expires first before my Blood rune become available. Example of the Rotation I use is posted below. Thank you for anyone with a kind heart to help me with this. Suggestions for other rotations are welcome, Thank You everyone and Respect.

IT > PS > BT > UA > Pesti > Obli > ERW >
Obli > Obli > Obli > FS > FS > FS

Obli > Obli > Pesti > BS > FS > FS
Obli > Obli > HB* > Obli > FS* > FS*

Obli > Obli > Pesti > BS > FS > FS
Obli > Obli > HB* > Obli > FS* > FS*

The only way I see FDK working now is that you completely ignore the fact that you can refresh diseases with Pestilence.
I need to check it in game, but rotation will be something like:

IT > PS > Obli > BS > BS > FS
Obli > Obli > Obli > FS > FS

IT > PS > Obli > BS > BS > FS
Obli > Obli > Obli > FS > FS

...repeat.

Glyphs of Disease should also be swaped for something else.
I will look into it today and make a reply in Frost DK guide I made.