I recently bought a kilo offrom Nutraplanet, and dosed it at ~5grams ED while on Superdrol. It nearly completely eliminates the 'tender back' feeling. beats Potassium by a long shot, but using both will probably help too.
If you want to go 100% on deadlifts or squats (and even cardio), Taurine is a must during a Superdrol cycle.
*It should also probably help accordingly with that other: more toxic, less expensive, HPTA slaughtering Methyl compound.