Yet another quickest 5 man RAF question

[sorry]

Hiya guys.
Starting multi-boxing in two weeks and have a couple of questions concerning RAF and lvling. I've read quite a bit on the forum, but couldn't find definite answers to my questions below.

BACKGROUND
I've got two accounts from before (never dual-boxed though) and I'm gonna add three more for a total of five. The plan is to end up with 5 shammies (one on each account) for PvP fun. I also plan on getting two paladins (on seperate accounts) so I'm able to run instances.

RAF:
My plan is to use my two accounts, let's call them A and B, to invite my new accounts (C, D and E).
A -> C and D.
B -> E.
This way all chars will be linked and be able to get the 300% bonus if I'm not mistaken. Anyone wanna confirm that I'm correct?
I then plan to get chars from accounts C, D and E to 'give levels' to chars on A and B.

ORIGINAL PLAN:
My original plan was to make 5 shammies, one on each account, and level them as a team (ele-shammies). The just before they got to 60 'give levels' so I'd end up with 5 shammies ~ 60, 1 pala ~ 60 and 1 pala ~ 30.
After that basically just lvl the shammie group to 80 and quest the low lvl pala up to high lvl pala, then lvl them together to 80.

HOWEVER:
I'm not really sure this is the fastest way to lvl the toons. I read somwhere that instance boosting is faster (I'd like some thoughts on this as well). If so I can use high lvls (got them on both accounts A and B) to drag my toons through instances up to 60 or whatever.
I could use one account (A) to boost 4 shammies 1 - 60 in instances (B, C, D and E).
Then use account B to boost last shammie, 2 palas and one more toon in the same manner (B, C, D and E).

I'd really like som input as to what the fastest method of lvling these gimps are!
I'm not worried about missing out on content since that starts @ 80 for me. All I want to do is lvl them as fast as possible since I don't have too much time to play. As such I'd like to spend as little as possible lvling


Thanks!
/Sorry