These turbos even when fully closed will only build about 1.5-2 pounds of boost at idle.

As Steve stated, take the truck in for the latest CAC hose recall. If it's already been in, take it again. It's either a crappy hose or the vanes on the turbo are stuck partially closed.

If all else fails, the rubber grommets used in leather for shoelace holes and some good self-tapping sheet metal screws will do the job