I also have a rogue powerleveling my toons (for the same reason, no aoe toons). I found out that lvling with 4 people is better because you get the +group xp bonus. My rogue is spec for pvp and have pvp gear and i am doing great (can easy ok zf haven't tried anything else after that), your spec with pve which should help you a lot more then my pve build. You should be able to do up to ZF with no problem.

What you might want to do, which i did for a little bit, is party with someone lower then your alts (like 1 lvl or same lvl) and have your alts follow that person. This way you can just focus on killing thing and that person will stay out of agro. Best thing is if they are 1 lvl lower then will agro before your alts . I did this for like 7 lvls (had 2 locks and a priest), the down side is that this person told a friend and the friend kept asking me to run them through sm. I told them that i have a full party, they asked if i could do it later and i said if i don't have a full party i will. Anyways, got my guys to lvl 34 which was the same lvl as my pally so i now run with pally and group so never have a free spot. The guy whispers me asking me to run him through i told him i have a full group then he whispers me RUN ME THROUGH NOW. I was like /ignore. What an ass demanding me a run. But anyway try to run your warrior and priest with a pick up random person. That should cut your time in half. You could also charge them per run. What i did was i told the person that i get all drops.