Bumps I now believe they are a fantastic carb once modified, very durable, pile of crap the way they were, but anyway we are over those problems. As for spring combinations I believe with the setup we now have their only purpose is to keep tension on the diaphragm so the spider will remain in contact with the cam and the only purpose the diaphragm now has is to hold onto the poppet and maybe as a gasket to prevent air being drawn in from around the cap
