Stuck with scapular winging and shoulder "impingement"?

Occasionally experiencing a pinched nerve with loss of biceps/brachioradialis strength and numbness (antero-superior irritation?) when getting close to my peak bench (press) performance (295x3 - 3 count pause reps). It grows during training when the muscles start to get jacked and stops almost immediately after taking NSAIDs (which I know is counter productive to training). It may be due to other variables like improper squat bar grip (too much shoulder loading) and other things such as poor posture as a desk jockey and side sleeping. I’ve had scapular winging since forever, and all the one-arm pushups with shoulder protrusions in the world don’t do anything to fix it.

To get to the point now. I’ve been consistent at balancing the posterior/anterior work (push/pull) to recenter the humerus (DB/BB Rows, etc.), although to what benefit I don’t really know. Perhaps I’m even overdoing the posterior work. Other than trying really really really hard to make the serratus anterior do it’s job to stabilize the scapula (pull back the humerus) when pressing, are there any lifts (bilateral/unilateral) I can add to my training to improve my scapular winging or am I doomed to reset my pressing lifts every 6 months or so?