Have you tried using caswells support? They are pretty good at trying to help you out. If the first suggestion doesn't work, keep asking questions. I seriously doubt that the copper wire has anything to do with it (if you hadn't polarized the solution). That's all I have ever used and have never had a problem. Another option is post your question on yahoo groups electroplating, it's free to join and the guys on there are very helpful. They are mostly hobby platers and I know someone on there has polarized their nickle at some point. It's a great group, even Mike Caswell is a member.
Darrin
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