I have a few more questions regarding this...

I've been dual-boxing for a while.
My two accounts were RAF linked but my 3 times XP bonus has run out.

If I would want to boost a new character with one of my higher characters, will I only get 3 XP per mob on my new character?
If yes, does it matter that they were RAF linked or would it be the same if the accounts were "normal"?

What would be the most effective way to boost a new character with a level 80 character? (I’m not planning to get another RAF linked account)

I’ve been searching for an answer to this but it seems that all I find is questions about the RAF nerf back last summer, 2009.