That's my friend Anke, we chat a lot and enjoy meeting up in Granada where the lucky girl lives and works. - she produces the best fitting patterns and works for a lot of the star of the flamenco world. Her reshaped sleeve head works perfectly, but I usually find that I have to reduce the width of the entire sleeve to get a snug fit if using a stretch fabric. The important bit is the armscye and that needs to be cut high into the armpit. As long as you draft your sleeve head to fit into the restricted armscye and you remove all the sleeve head fullness it's not really hard to alter a sloper.