>have you seen a study that tested for benefit of under supering on single brood chamber colonies with an excluder over
>the brood chamber?  Only then could you correctly assert that there is no research supporting bottom supering above single-broodnest hives


This study found no difference in supering positions. Not sure if it meets the exact conditions mentioned above but is really close.  

>Effects of top-versus bottom-supering on honey yield
>Jennifer Berry and Keith Delaplane  

>Abstract:
>Bottom-supering failed to achieve significantly higher honey yields than the less labor-intensive method of top-supering. The experiment was replicated >across three apiaries, and two nectar flows. 

Referenced in the Berry study was work by Sazbo. I couldn't get this one to read, but according to the reference, Sazbo's study did not find a difference. 

>A comparison of top and bottom supering on honey quantity and quality.  [1994] Szabo T.I. Sporns P. 

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