now if i understand you. your going to have 4 accounts. 3 in a multibox setup and 1 old account you will boost them with right?

well if the level are too high then that means no RAF bonus.

if W invites A and boosts then A gets no RAF as too high level difference.
if W invites B and boosts even with A in group ( A and B are not linked) then B gets no RAF as too high level difference
again with C

However if you have W invite A
A invites B linking them together. then A and B get RAF when together even when boosted. so if you want RAF you have to have 1 refer the other not the boosting account refer them all.

hope this helps you with your questions. if not or you have any others reply here or PM me and ill try help some more.