with your weight the 7,0 and the futura 111 is very small for you for this wind range.
isonic faster than futura. futura more comfortable, easier to handle, easier to use the straps and jibing like a machine.
for your objectives and your skills futura is much bigger fun. (by the way is cheaper too… )
i think the best set up is futura 131/76 wide and severne overdrive 8,5 would be for you. if you want to replace your 7,0 and you want to have not more than two sails, overdrive 7,5 is good. you can thinking on the severne reflexIII 8,6/7,0 too. reflex has better top end speed, but more difficult to use it and rig it – and more expensive.