as you wrote I do it with aero the way you descriebed...I go back and use a gust when it comes to get planning and if i do it like that and pump a little bit it get planning very nice.
the 8.5 would be the biggest sail for me (I also have S-Type 137) it means I will go with it most of time with 7.0 and/or 5.9.
The kode is my choice.
About the fins...I am kind of an extreme...I do sail usualy bigger sails than other do and I mount also bigger fins.
Thanks for the posts.