Yes, the IS97 will be very good, but I'm going to replace my IS101 (former IS97) and IS122 (former IS110/117) by 1 new IS107. It will fit both my sails 6.7 and 7.8 very well.
Sometimes I use my 7.8 on my IS101, but often it is not good enough, especially when the wind is not stable. It works better then on the IS122. I'm 87 kg.
So if I hear you say that the wind is often very gusty and you also want to use your 7.6, I would definitely go for the IS107.
IS87 / IS101 / IS122 / US147