360 lbs = 163.08 kg. Been there done that, actually raced the boat up to 170 kg and gotten 17th out of 43 F18's like that in light winds. It will be better to be at 140 kg = 310 lbs in such conditions but it is surprizing how small the effect of an additional 20 kg on board an F16 is, with the exception of the Taipan. I put it down to the modern hull shape with fat keels.

So it will not only float, it will race well with that weight on it too. If Nelson/Kranz are good sailors and figure out how to trim the Blade well quickly enough then they'll be in the front end of the pack. Experience is just so important because having the right trim is so important on these boats. Just as with the A-cats, have the right trim and you'll go fast, do not have the right trim and you'll be going 30 % slower. No amount of crew weight can offset that.

Wouter