If your account was ever flagged for RAF for more than the 14 (i think) days of free time, your accounts are permanently linked (unless one gets suspended).
In order to get the 50% XP bonus
-Accounts must be linked.
-Accounts might have to be gold?
In order to get the 300% XP Bonus:
- Both accounts must be gold
- Both accounts must be online
- Recruiter account's online character must be on the same server and higher level than the recruited character.
I have 3 RAF accounts, 1 has been active since the beginning, and the other 2 were inactive after the first game card time ran out.
I called Sony, asked them what accounts were linked to my Main's account as RAF, and they gave me a list of account names. I resubbed the 2 that were inactive to test the XP.. Poof, all 3 had the same 300% exp bonus.
Sorry if that doesn't answer the OP's question exactly, I was just giving my 2 cents on the RAF account subject,