Dan, here is my calculation on your Sabrebat. Rather conventional but on the light side with a foreplane loading factor of 130%.
The problem with most calculations - mine and the linked calculator given by Villa - is that they do NOT take the lifting force of the fuselage into account. And most of the fuse is in front of the c.g. which means that Lf must compensate for that also. No problem with you Villa having an aluminium spar as fuselage......
That is the reason why Dan (and others) must load the foreplane more.
Now sack time again...Good night./ Harald