I one position that relieves some stress pretty quickly is when riding the tops move the hands back toward you a little so the forward part of your palm, right behind the fingers, is resting on the bar. This seems to provide relief in just a few seconds.
Just on a chance, take another look at your saddle. Some saddles have a little kick up at the rear. You can lay a level on the saddle to get it level over all, but the part where you actually sit may be leaning you forward. I find this with my Brooks Team Professional. I have to tilt the nose up slightly to avoid feeling like I am being thrown forward.
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