If your booster is on the main acct that referred the other 4 accts, then no, you wont get RAF experience from boosting. If you make another brand new acct, and xfer the main to that one, then it will work, provided theres always a toon being boosted on the main acct the same level as the other 4. You also have to boost 4 at a time, and leave one stranded. Tough call IMO.

You also might consider moving the booster to one of the new RAF'd accts and boost the other 4, you lose out on some gifted levels but you dont have to round robin boost, and with 3 toons generating granted levels, you probably wont miss out.