Cliffo, I'm 98kg and run a 98L on 4.7 up to 6.5 (though the 6.5 is probably pushing upper limits on this board...).
The 6.5 is a Tushy Formula Light cambered (=pr#ck of a thing to rig but super stable!!) This is my 2nd Tushy, I have been really happy with them! The 4.7 is KA Kaos that have been borrowing from Rooster (Lee, Re discussion, are you a Beer or Bourbon man?) KA 4.7 is used for "fully sick" days like last Sunday. It too is a very stable sail!
Drop Rooster a line about the Ezzy's as he has a quiver of them!

In between is a 5.3 KA (after bottom panel replacement and mast top repair, it's still going strong Davo - Thanks heaps!!!

) though I would probably head for 5.4 or 5.5 if I were to replace it. To get a bit of extra range I'm using a 7.4 NP, but now need an old 120L+ board to carry it for those 15-20knot days.
Getting gone!!!
Seaton