Weld subframe connectors loaded or unloaded?

For the driving ability of most of us on here, no, there is not going to be a discernable difference in unloading the t-bars and making things ideal. However, if you are a person who can feel the difference a half a tank of gas makes in the turn in characteristics of your car, then yes, you probably should make every effort to make things square, level, and blueprint ideal.