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You may have to wait for someone who knows a lot more about the nagura thing than I do. In the meantime, here's a thread I remember from a while ago that I think you'll find useful.
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hehe - that happened to me Oz. Remember that unknown-origin suita I had with toxic su? Well, I did keep lapping away at that and eventually found me a layer that works. Not a great finisher like my...

First, read Glen's signature. It's golden advice.

Second, heed the words of U2, who penned this little ditty specifically about Jnats as finishers:

"I have climbed highest mountains
I have...