I saw John McEnroe win the NCAA college tennis championship when he was a freshman in college. His form would not be one you would want to copy as a tennis player, but he was consistent in his bad form and became one of the greatest players in history.
Jim Furyk's golf swing wouldn't be one you would want to copy because there is nothing at all classic about it and would be hard (for me) to replicate...but he is a world class golfer because he is consistent with his "bad" swing.
Whatever you are doing (right or wrong) works for you because you are able to replicate it. That is the key to being consistent (for me)...being able to replicate MY form consistently on my shots.
Back tension, using a second anchor, Terry's form clock, etc. make it easier to be a consistent good shot (for me) because it makes it easier to replicate that form. Use what works for you. If you think about it TOO much your consistency will suffer.