It's kind of funny the same thing happened to me. I haven't been riding as long as you have but I had the same problem. I was really pumping the miles out and then my knee started to bother me. Not bad but bad enough, it was right above the knee cap. I raised the saddle as high as I could get it and still had the pain.I was affraid I'd injure me knee, so I just went to get a bike fit yesterday. Surprise, it was in my cleats,he moved them up and when he done that my saddle was an 1" to low. With the weather being bad I only had a short ride (10 miles) and everything felt fine.I can really feel that inch,it feels like a foot,but I think it worked. Good luck, George
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George