You have all of my sympathy.
TOW is important, but not all. Of course TOW will tune a sailor into higher performances, but it's quite stupid feeling to use TOW just to sort out materials, expecially if the right informations are already available somewhere. Asking on the Starboard forum which fins do work well on the new board seems to me the best straightforward way to go to save precious TOW for other purposes, such as refining sailing skills.
Pity I'm not a formula sailor and I don't have those informations. I am in contact with a formula sailor friend who bought a 162 and has the same problem with fins.