... the level 18 was getting NO XP at all. RaF wouldn't apply in this case... the booster was a 90 on my veteran acct... and the lvl 18 was on my new Bnet acct.
I created a new Bnet acct with 5 toons using the RaF for them only, I know I can't use the veteran to get the raf bonus.
...the reason I tried the XP boosting is one toon was like 5% off of the other 4 toons, so I just wanted to bring that guy up to the same as the other 4 rather quickly.