I have this right now:

A: Level 76 Pally - Non RAF account
B: Level 59 shammy, 59 priest
C: Level 59 shammy, 59 priest
D: Level 59 shammy, 59 priest
E: Level 59 shammy, 30 priest

A>B>C>D>E

i used the shammies to up the priests to 59

now E is dead.

so I assume priests have 15 levels each to grant because I leveled from 1-30 then used the shammies grants to 59.

does the free levels still accrue when using granting on my priests? if it does that means they have 30 levels to grant except for E?

You mentioned grant B:60 to A: 15. But B has granted levels to A already. A is the one that hasnt granted to anyone because A is linked to my master account.