did you ever observed that those strong attached to metta (love...) have a tendency to be more corpulent? I am not sure, but I guess there is a secred link. Who gives much needs much, maybe. Some years ago I had my self 150 kg. But I guess we are running offtopic.
Bhikkhu Vimalaramsi, does great work and brings a lot of people on a good path and metta is of cause importand on the path, preconditioned one is on the path. Metta how ever is also a great trapping tool (just think on all that love affairs in religions) but it might have its danger that come with all drugs.
I remember that Mirco, a member here, has a lot of experianses once with metta meditation and also in regard of Bhikkhu Vimalaramsi approach to metta and the path. Maybe he will share some infos for you here, if not, you might send him a message. I am sure that your questions are very wellcome and also well answered.
Just that! *smile*
BUT! it is important to become a real Buddhist first. Like Punna did: Nate sante baram sokham _()_