I've always had the battle with lowert back pumps while cycling dbol. Radar suggested the lindbergs and it was very effective. I'm back on dbol again, but this time I'm in a cutting phase and with the limited carbs I'm not experiencing any major lower back or shin pumps with no supps or anything. I definitely believe that carb intake is a huge determinate in these pumps, though thios probably isn't much help b/c if you're bulking as most are with dbol they can't really limit their carbs, but I am convinced this is the major contributor.