I like my 100L SuperSport for the bay, while the SuperSport is not a full on Slalom board its suits me as most of my sailing is in the bay or the odd trip to Sandy Point.
The SuperSport is a little more user friendly than a slalom with a bit more nose lift and the straps probably not as close to the rail as a slalom, not as fast but not far off and still cranks up wind with a decent fin.
As for sails I use a 6.2 mostly or 7.2 as the bigest but the 6.2 is the sweet size.
I would prefer to be on a fsw board in bay chop or swell on a 90 - 95 .
Never really sailed a full on slalom just like my Supersports

Also these boards are more suited to slalom sails that give more down force.