Bike fit issue: deltoid pain?

I’m currently searching for a fitter in my area and thought I would see if anyone here could help.

Here is a pick of me on my bike. I’m about 6’1” and the bike is a Spec Tarmac in size 58.
My fit issue is mostly pain on the outside of the upper arm/deltoid that starts after about an hour of riding.
The stem is 12 degree rise 100mm set as high as it can on an uncut steerer tube. I’ve tried stems from 80-110 mm mounted in different configuration’s.

Any ideas on bike fit to address the deltoid pain?

Can you get a picture of yourself on the bike after you’ve been riding for at least 30 minutes and are settled into your natural position? The picture above in sandals and with a foot on the ground is not going to replicate how you’re supporting yourself while riding. Likewise, a picture of you right after you hop onto the bike will be unnaturally stiff and not how you actually ride

Recommend using MyVeloFit. Also, measure the width of your shoulders and compare that to your bar width.

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I look at your picture and read deltoid being shoulder area. I dont quite get how much weight would be on your deltoid in the position you show.

Is this the position you ride in?
I ride on the drops and more pressure on my hands. My issue with my hands meant I needed a stronger core.
I have also had various other issues but none were really fit related. They were all body related. I needed stretching, strengthening etc. Some of my own problems were how I was sitting and using the phone or keyboard when working from home. In essence I overused/misused various muscles.

That’s my riding position as close as I can get while sitting still. This was taken just after a 30 mile ride and the pain was definitely there.
Stretching while riding seems to help for a short period of time. I will definitely check out the bike fit site mentioned above.

I’m getting deltoid pain as well and never thought to look to but fit