in the beginning......i used black electrical tape to help float the barrel. if i recall, graybeard had suggested it. it works fine.
now, i actually prefer to use stainless steel washers placed between the barrel and forearm. make sure the barrel touches the wood, little as possible. if it needs some minor sanding on the sides etc.......... try to make a dollar bill slide somewhat freely between forearm and barrel.
if ya have any questions, or wanna talk with a fellow "TC NUT!" feel free to email me. i also have a 7-08, and love it. :-)