Talk:Success Guide/@comment-121.1.11.83-20130826075555/@comment-8961248-20130826100213

That would be because you get a quality bonus when your Design/Tech balance is close to an optimal Tech/Design ratio (see Raw Data for Review Algorithm).

That also means that if you keep your scores balances throughout the game, without ever changing the balance it wouldn't lower your score (since the quality of your game is modified, it affects all your scores, so it also affects your target score)