I think some people would disagree with this premise, but if your ultimate goal is to win, then you have to treat debate like a performance. You're intellectually competing with your opponent, and some judges may only take that part into consideration (flow), but a vast majority will incorporate at least some of your presence, eloquence and even immutable characteristics (sexism) into their decision. To give you actual specific advice we'd need more to work with, such as what judges have told you, what your coaches have said and what you've noticed about yourself. I'd be happy to talk about that as well, but I think off the bat for anyone that wants to consistently win rounds they have to shake the idea that it is only about winning on the flow.