Foam rolling and contouring will help, along with doing prone cobras. Another good way to develop TM is overheard squatting with a band and eventually progressing to a weighted bar or barbell.

I foam roll my lower body religiously but never felt the need to do upper body. Will start incorporating this. So you think improved TM would help develop the arch in the bench also? I have anterior pelvic tilt along with very tight hip flexors which are a problem.

one great stretch you can implement is the Thoracic Bridging. Look it up if you don't know. its awesome