I'm 86kg and I've sailed/tried several boards around that size (hyper, different iSonics 105-122). I use 7.3 and 9.0 sails on my 122 and for smaller sails there are better boards (6.8 not ideal). 8.8 will be a bit large for 111 if you use it a lot, expect slogging, etc.
Like Mim says, covering 6.7 to 9.0 range (about 10-20+ knots) is very demanding, imho almost impossible with a single board, you must compromise somewhere. If you sail mostly with 8.8 down to 7.3 I think 122 is your best bet. For 6.8 to 8.0 range (and only occasionally 8.8), then it's 111.