I have sinewed some pretty snakey curves,, and it was not a waste of time,,
and I guess that would vary from bow to bow,,,
in my opinion,, on lateral curves that tend to seperate at full draw,, the sinew adds stability to them,, making the bow a bit more likey to stay a bow,,, if it was my bow,,, I would tiller to half draw,, then put the sinew on before going to full draw,, I would wrap the sinew in areas that were likely to lift,,,, then I would shoot the bow as is with no additional tillering,,,unless I re wrapped after taking off wood,,,
looking at the bow ,,, I am just spit balling that the weight may be less than you want,, and the sinew would bring that up a bit,, or you could pull it to full draw with no backing,, and if it works you are good to go,,,:)