Hi Nathan, not team here.
A couple of things for you to consider. But I have not tried the 2012 iS80/86 so only guess work from me
1: If you are happy with the size of your existing iS86 then stick with the 2012 iS87.
2: The iS87 is heavy weights high wind slalom board, iS80 is light/med weight high wind slalom board. 94kg is heavy weight, so iS87 best.
3: Max sail size for iS87 is 7m, Max sail size fr iS80 is 6.5m. Your 7m Reflex would feel nicer on the iS87.
I have not seen the the iS80, older iS76 used to have more nose rocker than the old iS87, this gave the old iS87 higher speed potential. Not sure if the iS80 has more nose rocker than the iS87.
Just my 2 cents worth