Most batting has instuctions as to how closely it needs to be quilted. Even wall hangings can stretch over time :wink:
Could you dye a wool batting to match to your quilt top so that bearding wouldn't show? I believe wool doesn't usually beard, but that may depend on the thread you are using to quilt with...and if there are any burrs on your needle, too...
I can't wait to see your quilt :D:D:D