I'd treat pull ups with a bit of caution as the lats insert into the anterior of the humerus and cause i ternal rotation when tight.

Ensure you start each rep from a dead hang so that tve lats aren't firing in a shortened, restructive pattern.

Exercises that involve shoulder retraction such as rows, reverse fly and resistance band external rotations would be better suited along with stretch of the pec minor, anterior deltoid and coracobrachialis muscle