Do the deformers need to be active? or have you just used them to get this shape? You could do a current state to object to “bake” the deformers in, bool them together and then wrap everything into a hypernurbs object (sorry subdivision surface – that’s my age showing) and cut out the cusp as its called and bridge that area with something simple and let the subdivision smooth it out.
If the deformers need to stay intact you could try changing the phong angle in the phong tag – while not a perfect solution the cusp might not show. Adding a bool union to this trick might get rid of it too but you will loose the deformers again.
Or you could start again and bool two capsules and then apply two deformers