Neck Lift Problems? What should I do to fix?

You need to see a very experienced facelift surgeon for a second opinion.  This is a difficult problem and you  do not want to be worse. 

Based on the surgical experience you describe, I think you should listen to your "inner voice" telling you something may not be right, especially if the opinion of your original surgeon continues to change when the surgical problem at hand has not.

Adherent skin, too much fat excision, and tethering after surgery may be telling you that the original approach to your cosmetic concerns may not have been optimal. Certainly different surgeons can have different opinions, and often several surgical approaches might be considered for a specific cosmetic concern, but excisions and V-Y advancement flap reconstructions sound misapplied to this (loose neck skin and some "extra" fat) cosmetic concern.

I'd suggest additional consults (at least two) with ABPS-certified plastic surgeons experienced in facelift/necklift surgery. Your present recommendation just sounds a bit "off" to me, and I worry that your surgeon may not be a fully-trained and American Board of Plastic Surgery-certified plastic surgeon. Please verify credentials, and don't just accept a doctor telling you s/he is a "board-certified plastic surgeon." (Certified by what board? Plastic surgeon, facial plastic surgeon, or "cosmetic" surgeon?) Please do this before undergoing any additional surgery by your initial surgeon; even if this recommendation is absolutely on the up and up, at least you will have peace of mind, and will be aware of any other options available to you! Best wishes! Dr. Tholen