It's all very "wedged in there" at the moment. I'm using a coolingworks shroud (with the inner opening that fan is pulling through opened up so the airflow doesn't encounter a ridge - probably not an issue for pulling air through, which is what I'm doing). Anyway, this is already somewhat tapered, and a 6" (150mm) core is not lots bigger than a 120mm fan.
I understand that what I've done is increase pressure - essentially adding pumps in a series.
Bill Adams comments in one of this radiator reviews that stacking two 7V L1A fans doesn't help (at least with the radiator he was testing with).
I encountered another data point, thought I'd add it to the general knowledge.
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