yup, straight blackberry does make a thin bodied wine. i have found a couple ways to help, the first is that i use elderberrys in almost ALL my wines, i really like the way it adds body (tannins) to country wines. the second way , if you just HAVE to make straight blackberry, once its done with primary and secondary, i put it outdoors overnight and them strain the slush off. i only do this ONCE as i'm NOT trying to jack the alcohol up, i'm just trying to get a little bit of the water out. you would be suprised how much better it tastes! DISCLAIMER!!! this is ONLY theory, as to really do this would be illegal, we would'nt want to do anything illegal now would we boys!!