I have experience with this set up as I use it a lot here lately.
For sure you need to get a 33cm fin for the 7.0m sail. My set up here varies from a non cam 6.5 with the 103 to a 2 can 6.5 with the 103 in both instances I use the 33 slalom wave fin(free ride).
I fell the board comes to life with the two back straps in the 6.5 cam sail and when I want to due some bump and jump I use only one strap in the back with either the 6.5 non cam and a 6.0 no cam.
I like it also when you put the mast track 1cm in front of the recommended setting it gives the board a well balance ride with not much bouncing in the nose.
I am 78kg