Hi Dorian, I think the same rules may also apply to keywords in separate ad group requests in the same campaign request. All the keywords in a campaign pull from the same budget, so some keywords may be exhausting the hypothetical budget leaving none left for the others. Unfortunately the hypothetical budget used isn't configurable using the API. As you've found, if you want to closely emulate the UI you should use separate campaign requests. That said, more accurate results as to how a keyword may perform can be obtained by evaluating keywords together in unison.
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