At least 10 year, but more with same attenion to maintenance.

I don't think it has much to do with the overall weight of the boat and more with the skill level and quality control of the guy and company actually building the boat at a given weight.

I've seen rather new 182 kg F18's split on the hull during normal sailing and i've seen 102 kg taipan 4,9's survive many years of hard use.

I think your problem has alot more to do with the batch your boat came from then the specs of the F16 boats in general. Mine F16 is the same weight as yours and doesn't have a single problem since 2004 when it first sailed. And things do get rough overhere on the north sea.