Its way less boring than druid tanking.

i’ve been levelling 86-90 as blood, and it is far less boring. At least DK’s have some sort of active mitigation.
druids just seem to take every hit to the face.

though i feel i am using death strike wrong. should i hold off on using it, or just use it when ever I can?

Most of the time you should be fine just using it whenever you need to heal up. Unless you’re taking really heavy damage (like tanking Garrosh or heroic raid damage) then you need to actually time it.