Jseis 

Update; while on a cross state biz trip in the Tricities I spent an evening and dismantled the seat clamp. There was noticeable grit on the clamping surfaces so I cleaned them and the rails, the bolt screw threads, the "nut" surfaces (the nut is a cylinder that can pivot) and the surface the nut pivots against. Then slightly lubed the bolt screw threads and reassembled. I immediately noticed the clamp cinched down smoothly and without any grinding or crunching sounds, creaks or groans and I stopped several times and grabbed the horn and saddle seat and physically worked them to see if I could work any play out and I couldn't. Without a torque wrench I was guessing on the torque but I suppose 50-60 inch pounds? Maybe slightly more? The upshot? Saddle no longer creaks or moves and I assume the grit was acting like little ball bearings between the hard stainless steel rails and hard anodized seat clamp metal (aluminum?). Funny, the seat clamp appears to be an alloy but I can't believe its aluminum because the clamp horns are pretty small. Thanks for all the advice.