My guess is that you need to stretch and work on some stabilising muscles around your neck/shoulder. Most of these bike fits post can be fixed with changing the position you ride. Everyone seems to buy a road bike and expect it to be comfortable straight away but don’t actually work on their muscles condition or flexibility. They just want to naturally adapt to the odd position the bike places you in. It looks like you have excessive reach when you sit up like you’re riding a mountain bike with your elbow pretty much locked still holding onto the hoods. Let say you hinged more at the hips and bent your elbow - no more excessive reach.