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You might try a higher voltage insulation test. Faults that blow themselves clear can sometimes acheive a very high resistance on a dry day, but the creepage distance is small. Once the test voltage gets up towards flashover, the resistance avalanches. I have a selection of tools for this. The Megger (500V), the Big Megger (2.5kV), the Very Big Megger (10kV) and Cuthbert (30+30kV). Cuthbert is not allowed out to play very often. Many kinds of insulation cannot stand him at all!