I havent done bjj in a year and will be starting back up this friday and could use a few tips.First off im a big dude 6'0 300 combo of fat and muscle im by now means weak. In my previous experience i found rolls would allways be me on top going for kimura or americana a few rnc and that was it. Im hoping to become a well rounded person and not rely on size and strength. so any tip u have would be great thanx.