Filthy Casual looking for DRK advice

[Fluffernuff]

So, I tend to avoid Savage or EX fights mostly because personal reasons, so this is more for braindead roulettes, though I would welcome anything from those environments that would apply.

I'm actually more concerned with trash pulls and the like, Since I never really drop aggro on bosses without touching grit. Though I almost exclusively stick to grit on trash pulls because I'm concerned about AoE emnity and to help the healer. I cycle my cooldowns like shadowskin+foresight, and when its off cooldown, I'll do my DA+DP/DA+DD dodgey combo. and of course blood price off cooldown. I'll use either unleash or abyssal drain, depending on my target and how the mobs are bunched up, sometimes abyssal drain wont reach everything.

My concern here is mostly... My "pocket healer" friend I almost exclusively play with has a hard time with cleric stance. A combination of I tend to pull alot so my HP spikes and they are not COMPLETELY comfortable with the tool yet (this is admittedly my fault for scarring them from ever using it because I pull half a dungeon in ARR content when they were new).
In essence, I would like to know what cooldowns I should be cycling, if I even need to change that, or are there times where I can just help ease my friend into CS with my own tools as a DRK?

Are there times I can safely drop grit, even on large trash pulls?