You're right Tony, the Stealth (or any F16) in uni config wouldn't be able to sail to 98. I thought that Texel rated F16 uni @ 99 and SCHRS has it at 0.98. Sloop is 102 (Texel) and 1.02 (SCHRS).
We have demonstrated time and again that the two versions are very even against each other and 1.02/102 is fair in most conditions against more established handicaps - but then that's the fault of the handicap system, not the boat!

From my own experience, you can get some good boat-on-boat racing against F18s, Hurricane SXs, Spitfires etc. in sloop mode. I just accept that I'd have to do something pretty spectacular to win in uni mode....
The low weight has been a revalation to me - I can now pull the boat back up the beach solo after racing!!! The foiled rudders are fantastic when it blows, they just give you so much confidence to push the boat hard downwind. The only penalty is that you have to be careful in shallows as the rudders won't kick-up of course.