I don't know your equipment but, imo, the best way too shoot street shots is in raw with A preferred and always set to take good pictures of skin in the ambient environment but with your finger on the EC toggle.
As you bring the camera up, decide whether the EC needs to be adjusted.
By the time the camera gets to your eye, you should be in process.
As far as leveling decisions: unless a tilt is for artistic reasons, correct the most obvious vertical/horizontal that the viewer will assume is 'correct.' Thus walls should be vertical as is anything gravity-placed.
Don't attract the viewers' attention to anything that isn't important.