Weird. I've got a Oneup V2 dropper on my Stanton too and it's been good. Have used it for about a year. It's a shorter 150mm and an older Sherpa made of 853, don't need as much clamp force maybe.
Mine's the newer but cheaper version so perhaps the seat tube tolerances are a bit sloppier?
The OneUp, when installed into the Spark (with a shim to take it to 31.6?) seems fine. It's the combo with the Stanton that is the problem.
Do you shim it? Steel tubes often need a shim.
@hippy started
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Weird. I've got a Oneup V2 dropper on my Stanton too and it's been good. Have used it for about a year. It's a shorter 150mm and an older Sherpa made of 853, don't need as much clamp force maybe.