Please don't sign your posts. Also, the first person pronoun "I" is capitalized in English. Thanks.
My Problem with the FM-FFB Switch was following:
After i switched from FM-Buff-Build back to FFB Build i lost the FM Buff given to me.
The FM i casted on an other Mage stayed on the Target after the Talent Spec Switch.
So it looks like it is not possible with 2 Mages with a FFB Build giving each other the FM Buff.
What i can tell about this Spec it is really annoying, after some time. I also had the Problem that the Mage i was buffing was always one of the last zoning back.