Golfer elbow

You're old.
Me too.

Golfer's elbow, also known as medial epicondylitis, is caused by damage to the muscles and tendons that control your wrist and fingers. The damage is typically related to excess or repeated stress — especially forceful wrist and finger motions. Improper lifting, throwing or hitting, as well as too little warmup or poor conditioning, also can contribute to golfer's elbow.

You can take steps to prevent golfer's elbow:

Strengthen your forearm muscles. Use light weights or squeeze a tennis ball. Even simple exercises can help your muscles absorb the energy of sudden physical stress.
Stretch before your activity. Walk or jog for a few minutes to warm up your muscles. Then do gentle stretches before you begin your game.
Fix your form. Whatever your sport, ask an instructor to check your form to avoid overload on muscles.
Use the right equipment. If you're using older golfing irons, consider upgrading to lighter graphite clubs. If you play tennis, make sure your racket fits you. A racket with a small grip or a heavy head may increase the risk of elbow problems.
Lift properly. When lifting anything — including free weights — keep your wrist rigid and stable to reduce the force to your elbow.
Know when to rest. Try not to overuse your elbow. At the first sign of elbow pain, take a break.

My wife is a PT. Always tells me to stretch and work on my forearm muscles. I have a squeeze ball at my work desk and in my car. Try using it when I can.

Try out some lighter shafts. I’m assuming your DGs are 130ish gram shafts. Try maybe some lighter Modus 3s or KBS’s

You're on another level when specific shafts are causing this.

Maybe you swing those shafts a touch steeper and dig slightly more, causing a bit more jarring impact on your joints?

Idk, that's wild.

i've tried the origional steelfibers but not the new models. Didn't like them too much with torque being so high, i couldn't get the face square at impact. May need to give them a second look though with the newer model(s).

I switched irons and shafts a few years ago and developed tendonitis in my elbow. Got a cortisone shot and the pain went away after a couple of days. I am fairly aggressive when it comes to medical care as in if I have to have surgery then let's do it. Had wrist pain two weeks ago, got a cortisone shot and the pain is now gone. Never had luck with elbow bands, ice or anti inflammatories.