IS 110 is my first Starboard, so I can't compare with other boards of the range.
7.8 and 8.6 are for me the best 2 sails for this board, 8.6 is still easy to uphaul.
My low wind range : 13/15 knots (below 13 Knots I use a FW 168L + 11mē)
High Wind range : 22/25 knots
I usually use the board on very flat water (a lake) , I used it sometimes at the see, in nasty chop it's ok, but IS 107 will probably be better.