Bart,

your weight has some advantage and disadvantage. I think that sailing a single handed cat will give you both no mather what cat you choose. The last two seasons I had the opportunity to sail on the F16. Sailed on the Taipan an the Blade. My personal choise would be the Blade beceause the design is newer and to my opinion it runs a bit faster. These boats are designed for two people with an optimum weight between 130 and 140 kilo's (no issue when sailing the boat with 170 kg but one can feel the difference)it the, so in your case there will be no issue of boat strength.
I haven't sailed the H17 or the FX one so can't help you there.

For my cat experience in general I can tell you that I started cat sailing about 30 years ago on the Noordzee where I still have a good time on several different cats

Dolly