Ping Karl B..... before he was an F16 guy, he led a single handed campaign to get hobie world to support the FX1 with a NA's and promotion and buy in from the Hobie single handed 14 and 17 sailors.
Also, search the archive for Wouter Hs thoughts on the FX1, he chartered the boat for a week on holiday just after it came out and it figured into his support of the F16 idea.
I don't think the US ever held a one design FX1 race.... Critical mass never materialized. I would not be surprised if most of the imported boats were subsequently exported back to the EU.
Final contact might be Jim G, Jim sails Hobie 16s, Waves, Hobie 17s and owned an FX1 He raced it in at least one or two regattas and distance races.