I have been using the Airflo Delta tapers or what ever they call 'em now for a few years on my trout rods. They appear to be similar in form to the wolf lines.
Flytalk did you get in contact with Wulff & see what they have to say?
You might try that route. I know I had an issue with a Rio line & they sent me a new one after I sent the bad one back. Maybe Wulff will be as accommodating