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 [RC] supracor - Dawn Simas
 I have a supracor barrel racer that fits my aussie endurance saddle, and an english supracor for my aussie stock saddle.  Both are two years old, I ride twice a week year round, and they don't look any different than when they were new.  I do have covers for them, maybe the sweat is breaking yours down?  Although they still get sweat through the wool underside, not as much as if you use them as a "cool grip" pad directly on the horse... 
As for breaking down at the withers:  You may want to check into a jumping supracor model style.  It is specifically more firm at the shoulder/wither than the rest of the pad.  :)   
Dawn 
 
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