Mikelet my Spanish kite twin! We seem to ride all the same gear.
Yes, I found the NSP-FCS adapters too and wanted to try them out last session I had. Couldn't push them inside the boxes far enough for the screws that came with the adapters to get a grip on the other side. I'm going to give it another try with the screws from the original fins. Maybe they are a bit longer or I'm able to push them in a bit further when I have the right tools for it. Hmm, maybe I turned them the wrong way last time. Got to give it another try and I'll get back to you
Yes, I have the Underground Freewave 5'4". Some pics of me riding it
here. It has really sharp rails so it feels like a mix of a directional and a twintip. It has a tendency to catch rail on top turns which I hate
It's built like a brick wall (and flexes like one too). I've landed some pretty big kiteloops with it and there is just no way that you can get any dents in it. I'm sure you can snap it but I think you will snap something in your knees first. I don't use it that often anymore. Only when it's +40 knots and then with the straps on. I prefer boards that feels like a surfboard but I'm keeping it for the really windy days.
If I were you I would look into the
Airush Choptop 2009 instead. I haven't seen it in person but it looks like a better board than the Freewave 5'4". Just promise me to lose the skyhooks that it comes with