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I would not use insulation board.

Reinstall the neoprene strip without the 3M 5200. It is unnecessary.

For those not wanting to foam in the tanks, materials used to keep the tank secured include composite board (phenolic, starboard etc) and hose.

Use rubber strips under the metal straps.

Typically the floor of the cavity have angled strips or sections of hose that allow water to travel to the bottom of the V and to the rear of the cavity. For the side walls, angled strips or hose sections are installed.

Use adhesive (i.e 3M 4200) to attach the strips, not fasteners.

Here are photos from Chris LeBlanc, a member who also owns The Boat Shop, Ltd in Nova Scotia.
http://s9.photobucket.com/user/95Outr...6&o=44