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hilly said..
Armstrong with 1550 is about 3kg. Felt super-light compared to my old Axis setup. Really noticed it when paddling the sup, way less stable without the solid ali fuse of the Axis as a counterweight. The 2400 foil floats so you have to push it under

Please weigh your Armstrong setup and tell us!
In my experience the stiffness of the foil And especially the mast is much more important for stability than the weight of the fuse , I tried some very heavy foils and they were very unstable because of a soft mast.
So perhaps your Armstrong is just less stiff then Axis?
And my Axis S1020 also floats and has to be pushed under....