I constantly level new teams up via boosting.

Few things I can possibly help you with.

RFC, do the entire instance in 3 pulls. Extremely efficient this way and you only need to move your low levels once. (I use a DK so my survivability might be better as such my advice on the number of pulls may be moot )

Pull all the troggs at the base level, including the side tunnels. Pull them halfway back up the ramp to the zone in and kill them.

Run your lowbies down to the lava before you take the right hand turn up the ramp. Park them about 1/3rd of the way up, against the wall.

Clear the remaining troggs/elementals up to the orc area.

Do the orc area in one pull, pull up the right side, up the ramp and then drop down to that other boss and agro everything else on the way out. Kill them just to the right of the last bridge you cross heading out of the orc area to LOS the casters.

I prefer SFK, you never have to move them. You get XP at the zone in throughout the entire instance. I do this at 15, its super easy and fast.

I move to SM at 21 until 40. You never have to move from the zone in when doing cathedral. I do Armory and Cathedral before I reset since all 4 instances are considered 1 instance. This allows me to delay running into the instance cap.

I pull armory in 3 pulls at level 80. This MIGHT not be doable with a warlock, but I will describe the process. First courtyard is pull number 1, I agro it all and then kill it all on the first stairs down.

Pull 2 is everything left before the stairs up halfwayish through the instance. The stairs ARE the cutoff point for XP at the zone in. So what I do is kill behind a wall away from the stairs and then run to herod, agroing everything and then back to the location I killed the second pull at. If you can manage to get in and out at level 80, this will speed the process up tremendously. IF you cannot, parking your lowbies at the top of the stairs after pull 2 will work as well.

Next is ZF which I generally do until 45. Where you have safe loc 2, if you move to the other side on top of the hill, you are 100% safe from agro. Additionally you can leave them there for the rest of the instance so long as you are willing to pull monsters out of one area. If you pull everything in the green area back past safe loc 5 you will get XP, if you pull everything in the purple area down to safe loc 3 you will also get XP with your guys at safe loc 2.

However, given that you are using a warlock, I have an alternate suggestion for you. Put your lowbies on follow, and tab target through everything and dot it up and just run a lap of the instance. I've done that to great effect with a level 70 warlock back in 2007.

After ZF it is a bit of a crap shoot. I'll do BRD with my druids I think since I can dump about 15k instantly aoe style with howling blast.