Considering thatyou are sailing on a lake with 7-15knots i would get the 117wide carbon, it will be so much nicer in the lulls .
I´m 88kg and use a 127 carbon with 9.3 and 7.6 vapors. it´s still really fast in 20knots of wind with a 7.6 and fully controllable. you can easily use the 117wide with the 6.9 up to and above 20knots. and then you can switch to smaller gear.
A 107 in 7knot lulls will not be fun, your gybes will suffer and you will have to pump a lot!