trimm questions for sonic 85 & isonic 115

[didier01]

Hello,

I own an isonic 115 (used sails: rs6 8,4 & 7,2) and a sonic 85 (used sail: rs6 6,2). To increase their performance I have some questions...

Could you please tell me -for my weight (75kg) and height (1.74m)- where I should place:
*my mastfoot
*my footstraps
for the different sails on the boards

Also could you indicate what fins (brand/type/size) I should use as an upgrade for the standard ones?

Many thanks in advance!
Didier