Iv'e done that Ian, last week. I ran wires to the +5 and 0v of the processor, but no huge improvement.
About an hour ago i started a new layout with autotrax. Should be finished late next week,and it will have ground plane. The version of autotrax i use ( the old DOS version :D ) doesnt do ground planes well - there is a bug in it, but you can do them manually.
Its looking more and more like a simple layout problem. Every time I make a board change there is a slight improvement but it doesnt fix it; just takes longer and longer to get a meaningful test result.
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