Pullovers should be part of any chest routine. Use them as one of the last exercises of the workout after other muscles are already fatigued.
Finish your next chest workout with dumbbell pullovers: 3-4 sets of 12-15 reps. Focus on squeezing the pecs to initiate the movement up from the bottom position and work on holding the squeeze throughout the rep.
Foam rollers, lacrosse balls, back walking, kettlebells. Can these work as tools to fix tightness and pain? Not when you use them like this. Here's what works better.