Ive got a few young meads in the aging process that still leaves the mouth feeling empty. Now is that Tannins that gives that effect, i also have an acid blend i havent tried out yet.
There are several things that can help - the most important of which is age. Residual sugar, mannoproteins from lees, wine tannins, oak, glycerin, & gum arabic are all things that can be used. Some yeast are better than others at creating body too.
Here's a link to an to an experiment that I conducted: Improving Mouthfeel with Oak and Acid. I have yet to conduct Round 3.
Oh and I just noticed where you live! I have family in horseheads! I might be stalking you soon!