Yeah! What everyone said.
Are kb halos, chops, lunges, windmills helping? If your hips and low low back are “blocked” all the motion from these crazy moves will occur in like 1 disc, which will need to move A LOT. Vs a small amount of motion in multiple discs. For Sure evaluate these moves carefully.
Upper chest and shoulders not growing? And standing up straight hurts? Its sounds like your back is stuck in extension, like you’re so “arched” its hard to get the work off the pec majors, and up onto the upper chest and shoulders.
If that’s the case, think about keeping your back flat, and your ribs down, and your abs tight. Maybe try putting your feet up to take the pressure off your back.
And not this, we’re You’re extended and squeezing up your back.
If OHP causes problems, consider the Arnold Press. The way you keep your arms in front at the bottom makes it easier to keep tightness in your abs and not get extended and compress your back.
Or do some high reps delt raises with short rests.