Fins for Futura 111

[Fernando Luz]

Hi,
I'm getting some problems with the stock fin Drake Freeslalom Swift 38, of my board.

I was thinking in maybe to modify it for the Select Elite slalom fins !

As I wrote, I have a Futura 111 (2008), a quiver of sails from NS X-type 6.0, a NS X-type 7.3 and a NP Hellcat 8.2.
My weigth is arround 68 Kgs., and the wind where I often sail (inland) blows betwen 10/14 knots, and, some times get out to the coast where the windy conditions are stronger.

Well, my questions are:
1. Is a good thinking to change the stock fin for just 2 news fins from Select Elite Slalom fins, for this kind of quiver ?

2. One fin for the sails 7.3 and 8.2 and another one just for the windy days with the 6.0 ?

3. What is your advice about sizes ?

Many thanks in advance from a sailor that apreciate very much your expertise. Best regards,
Fernando