I get how the earrings help with getting from 50 to 51 but doesn't the bonus XP turn off after that?
At that point you're no longer "50 and below", right?
If simply level syncing down to 50 reactivates the XP bonus wouldn't syncing to 30 or below provide an even higher bonus with the brand-new ring thrown in?
Or even to 25 and below if one also has access to a friendship circlet?