Use them all. Sometimes you can find a nice little blowdown or ditch to set in. Other times you can make a natural ground blind quite easily with what's at hand. I would think with your back the important thing is to get COMFORTABLE. Use a chair or stool. Back up to a tree, put some limbs and junk around you but far enough away to allow you to swing and shoot. You may want to try one of those bow blinds that goes where your stabilizer goes and fans out like an umbrella. The big pop up blinds are nice but need to be brushed in and in place for the deer to get used to them. You must sit wary wary still when huntin' wabbits and deer.