I would say if you're a little afraid of getting banned, grinding only is not (pretty obviously actually) best. I do Mixed & Grinding, and the BG quoues are almost instant at my server, aslong as you're above level 30. So it's like - in to a BG - win - out, kill 5-10 mobs - in again.
Also I had enough honor to buy full Brutal on my rogue when it hit 70, plus a PvP mount.
My record is 1-80 with a Paladin on a little more than 2 days which were mostly Mixed mode.
I personally think InstanceBuddy do need some babysitting.