If I have one piece of advice to give (that you probably already know), it is to have a sound way to measure results and ensure that you are improving. Usually

If I have one piece of advice to give (that you probably already know), it is to have a sound way to measure results and ensure that you are improving. Usually that involves custom tooling that falls within the integration test layer. So if 'inspecting the differences' is a reproducible and statistically reliable way to know that you are good - then you probably are!