Do a large amount of people have a problem boosting with a linked toon? I have yet to see an issue with using a linked toon to boost. I have 5 accounts linked a->b->c->d->e and my main on a has already boosted 2 teams of 4 up to 60 without once losing the RAF triple XP. So you may or may not have an issue with raf xp gains. I would say, go into an instance with your 3 linked toons and test it out for yourself. After killing some mobs check your log to see if you are, in fact, getting the extra xp.