why ?
Of all the statements above I agree with the last line form big Pistons the most !
The light twin is overpowered on two engines so that it can (just) perform on one engine if required to do so, my view is that you should be as gentle as you can with both engines to preserve them so that if you need full power from one engine it will be able to make full power.
Tankengine while from an indication point of view you are utterly correct about the oversquare thing, however due to the temp rise of the charge I doubt if the absolute volume of the charge reaching the cylinders is very far adrift from a normaly aspirated engine on a ISA day, of course supercharged engines can maintain ISA conditions in the manifold during conditions far above ISA.