$.02 raise your saddle 1/4"-1/2" and learn to rotate your pelvis down a bit more, flatten your back and bring your chest more forward so your head sits 1/2" back with a smidge more bend in the elbows. Instead of sitting flat on the seat with a slightly bowed back flatten/ lengthen your back. Your lower back looks bowed a bit instead of a dynamic bridge to your shoulders. Also get off the bike and stretch but see what you can do to make your spine long.