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Could be a manufacturing issue with the coils since some set fall flat and others only stumble a tad...
I'd make my own DC-DC converter, in your shoes. You just need a simple 555 osc. chip (and some R's and C's for it), a power FET, and a flyback from a junk BPC set. I built a 30KV plasma speaker that way with cheap parts and junk, and I'm sure I could de-tune it to produce 4-7KV.
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