You forgot another buff.
30 all stats for 5 min - kill a Spore Bat in Zangarmarsh and you get this buff
Its 60ap and ~0.75% crit for every rogue not calculating kings and rage ...

Wouldn't it be a bit difficult to setup that buff for 1 Teron fight? Especially seeing that the person that gathers the buff still has to zone in, and then get summoned to Teron, that would be cutting it pretty close on the buff time. When 2.4 goes live I suppose it would be a bit easier seeing as you could then summon people directly to Teron, but right now that seems like alot of effort for a minor dps increase.

Gift goes up rather quickly and I haven't seen it fall off once it's up.
With not a lot to do in live currently I've been trying to big TPS numbers on teron so I was using agi/gift.
If I'm bored when the fair comes around next I'll do the grandmother quest line and show up to teron with fair buff and the quest line buff to see how high I can get it.