hey mjp 12,
i m herve from frejus ( south east france ), ok cap breton is south west opposite side but like paul 1 said poor conditions if you re after waves at this time of year.
talking about kite size: i d skip the nine and bring 7 as well as 11,5.
The reason is your going to spain and portugal, and i know for sure cause i ve been there, in case you need a bigger size, a shop in viana do castello ( north west port.) will rent u some gear no worries, mind you, you might not need it cause this place is quiet windy especially, in J J A, with some good waves at times.
gincho ( cascais lisbonn ) further south, very windy beautifull place, good vibes, the shop there at the kite spot down the hotel will rent gear as well, boards and kites.
on your way there, you might want to stop at peniche and nazare, lovely places, not sure about the rentals though.
i suppose as you ll be in cap breton, you ll be travelling, through GALICIA, north spain, a place like la coruna offers heaps of good spots around, wind and waves, valdovinio is good, but i m not sure about rentals either, actually kiters and windsurfers based in viana, make a move to galicia when the wind is lower on the west coast of portugal, a bit like in WA, when perth gets really hot and we have to go south in augusta, albany or esperance to use the easterly

;...
about france, mistral (south east ) can hit sort of anytime during the year, depending on where you ll be around sept oct, leucate and gruissan (tramontane wind) are places around the city of narbonne with heaps of wind almost all year round, so you ll be happy there.
if you happen to come south east, you ll be able to rent a big size kite here with herve, ( rousseau this one ), as we have light conditions sometimes, so let me know if you need more infos, and we can catch up if you wish, you r more than welcome to come and kite in my country mate

, rv.