IMHO - I think the 130litre board is still to close to the 116. I'm not sure of the range(width) of your 116AHD.
I have 2 Exocets, a cross117 and a Speed slider77(135l) and its to close. Out of the two, I now find myself only sailing the C117 as it planes easily. Therefore have little use for the SS77 except for the lightest of winds. The C117 can hold up to a 8.0m but I only go as big as a 7.5(Ezzy inf.) with it, and its enough to get planing at around 12-15kts. BTW I am also 80kg.
I have an 8.5M to use with the SS77, it does hold the plane easily though, so maybe an Exocet SCross 140 would be a better choice and give you a touch more float on fresh water. That combo would definately give you more time on the water.

Test one up at Caloundra..
http://www.caloundracitysailboards.com.au/boards_exocet.htmlI see they are on special at the moment.
Cheers
DavMen