I think alot depends on what kind of air you're sailing in. If its really blowing a flater spin on these boats is probably best.

I found some info from Multihulls Mag about the F25c: concerning weight:

Displacement

Dry 1180lbs/535.3kgs
Sailing 1490lbs/ 675.9kg

According to Multihulls Magazine who probably never weigh one of the boats themselves but the F25c is apparently lighter than that F82R.

thom