I custom built my sewing/cutting table and it is adjustable in 5" increments from 30" to 45" depending on whether or not I'm in a chair to sew or standing up to cut. Right now I keep it at 30" for no particular reason (and it does hurt my back at this setting), but I want an adjustable chair so I can set it where I want and be comfy. Standing up it seems to work best at either 35" or 40", but again I am 6'1" and that might make a difference. Hope you get it worked out. Lower back pain is nothing to laugh about.