lets agree that circling approach is a continuation of an instrument approach and visual circuits are Visual flights off the instruments and its rules ... whenever IFR pilots like to do visual circuits they should cancel their IFR and declare VMC then if the airports minimums is within VFR limits then he can carry the visual approach either coming overhead to join downwind leg or adjust to join downwind leg and so on ...
for your scenario at OLBA VOR approach MDA is less than circling minima so which is better to fly 800’ or 1100’ ???