Volume old and new boards

[Johan van Die]

Hey Roger,

I have some questions about the volume of my old board and how that compares to the new boards.
My old boards are a Copello 285 course race and a Bic Vivace 270 from the mid 90's. Copello 285 / 57 / 112L Bic 270 / 57 / 96L.
I use the 285 with a 7.4, 6.6, and sometimes with an 8.9.
I use the 270 with a 6.6, 5.5, 5.0, and sometimes with a 4.6.
Q: Will a new board (Isonic 105 233 / 63 / 105L 5.5-8.5) have the same flotation as my 285?
Will I be able to pull up my sail like on the 285?
Is 285 / 57 / 112L equal to 233 / 63 / 105L?
How do I pick a board for the 7.4, 6.6, and sometime an 8.9?
Do I go for volume or width or both?

Why can a 248 / 71 / 115L take 6.5 - 9.5 and a 245 / 67 / 120L only take 5.5 - 8.0 with 5L more?
Is it possible to put a 9.0 on the 120L board?

I am looking for a board that will take an 8.9 / 7.4 / 6.6 and maybe a 5.5, with ????L volume and does well on a lake with 2'chop and gusty wind.
The board has to plane fast, have good control, jibe well, and bring me home when the wind dies.

I am 6' 185lbs.

Thanks,

Johan.