For the h nub or the scs to work you need to do 2 things.
1 is to remove the hump from inside of the rubber or buy a rubber with the hump absent.
2 you will need another rubber to cut peices out of to go between the hnub (or scs) and the rubber on the barrel to act as a sort of spacer or the hnub will not go far enough into the hop window to apply any hop. This is why the newer/beter designs have the standard type nub with either a flat or H type nub attached to it so the nub will push the smooth rubber far enough into the window to apply hop.
Like so
So id say aside from r hop one of those bridge tensioners in the pic and a smootb rubber (or modded rubber)