I'm with omerta - ditch the activity that irritates your shins and let them heal. You're on gear, they should heal fast.
Speaking of which, maybe the lower back pain is a pump - you're on dbol. Does the pain go away after your set is done, or is it lower back DOMS? If it's DOMS, your back will get stronger and you won't notice it. If it's not DOMS, you've got lower back pumps. Try taurine.
Glad you liked the BOSU crunches.
