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DH

Regarding the proper technique for installing the tank, a majority of members I know or threads I have read go with the factory method. This is not to say the blocking method does not have merit. 

Members who plan to own the boat for a long time or don't like the water saturation go with blocks. 

An unscientific percent would be 70% foam it and 30% block the tank. 

While I have dri-dek on my entire floor (see my personal page) I am not sure the material can take a significant load without compressing. 

Blocking on the bottom of the V and the sides with space at the bottom for water to move is sufficient. 

Hope this helps.