I have ridden for 5 years with a knot in each shoulder. The exact location would always bother me a lot on long rides, but i just “ignored” it during the ride. I’ve been getting deep tissue massages last couple of years, but could never get rid of those knots. I actually just told myself that the knots were always going to be there.
Then during my last massage, my masseuse recommended cupping. Best recommendation ever. Made my riding so much more enjoyable. In one session, the cupping got rid of both knots and i no longer have that pain on my rides. If deep tissue doesn’t remove your knots, try cupping as it can get deeper.