Hi Jörg, thanks, glad to hear you like the products, it was quite a massive challenge to get a connection piece which can hold up to all the new loads, but we are really happy with the SLS/D/Lab connection and there are no plans to change this at all for the future. The only long term plan is to try to make the Alu range compatible in the fuselage/mast connection, but this is not quite as simple as thought, but we are working on that.
Profiles are slightly different actually, generally in foiling it's quite hard to find major performance differences on top speed, I ride every single session with a Garmin and log everything in Strava - really hard to peak over certain speeds once you max out. And yes, our AL is very stiff already. Mainly a weight/performance increase, between Alu/Carbon.
Re your suggestion, yes, also working on something similar for the future. thanks and have a good wing day!