I've read numerous times that the only portion of the recoil lug that should be in firm contact with the glass bedding is the rear face. The sides, bottom, and front face of the recoil lug should have clearance after the tape is removed. Particularly the bottom of the recoil lug. With the greater length of steel to the bottom edge of the recoil lug, as the recoil lug heats up it will expand more so the the barrel and could result in the bottom of the recoil lug inpacting the glass bedding and lifting the barrel off the glass bedded barrel channel. The longer the length of a piece of steel, the greater the elongation under the heat of expansion. And the recoil lug is longer that the width of the barrel in the chamber area, and even the action.
Oh yeah... nice photos and description of the glass bedding process. I think I understood it all.
Thanks for sharing your process with us.