If the mast is 2005 then the sail is not matching the Infusion sail. The infusion has a different mast (wing mast). The total sail surface in F18 is determined by sail+mast so this will let you end up with a smaller sail surface.

Setting up
- mast rake to upper connection point rudder.
- spreaders depending on crew weight.

See you at Texel.
Enjoy.
Jeroen