This has been discussed multiple times in other threads.

In a nutshell:

If you are looking to boost, you cannot have your group set up as follows:

A = Booster

B-E = Boostees

A -RAF-> B
A -RAF-> C
A -RAF-> D
A -RAF-> E


I believe when RAF first started, this used to work OK but Blizzard changed it.

However, you CAN do this and have it work:

A -RAF-> B -RAF-> C -RAF-> D -RAF-> E


The daisychain still preserves individual RAF links with the low levels, so they still all get 3X Experience.

Some people still leave out RAF on A and just daisychain B-E, and that works too, obviously.