Spammable Death Strike/Obliterate macro...

[Kekkerer]

The above castsequence is terribly inefficient, at minimum you need 1 spammable button for single target and another for aoe. If you're keen on continuing with castsequences then at least you can make your situation a little better with a 2 step macro where heart strike is on step 2 and not in the main sequence. Castsequences have their uses but one can't play DKs like they may box other classes.

Edit: if you're pulling aggro off the tank while in blood spec and unholy presence then that is a tanking issue not your spec.