I've been riding for roughly six months and experience numbness during every ride (30-40miles). I was first told don't worry about it, but now the numbness won't go away. A respected bike shop fit me for my bike, so I'm not sure what's going on. Is it my position in the saddle? Should I get a new saddle? If so, what kind? Should I raise or lower my saddle? Thanks for any suggestions or insight you might be able to offer.