Charlie, I've been chewing on this a bit and am curious if I have it right:

VE tables are for the range of a given bin - say the 500 rpm spread from 1000-1500, where operation is between those rpm levels. Fuel needs (and VE) are dependant upon - and counted by - the number of ignition events (rpms), so VE would be significantly different at 1001 rpms from what it would be at 1499 rpms.

So, if I want the 3D plot to look smooth from bin to bin - and to give the best chance of the ECU reacting correctly through a bin at all rpm levels, I really need to tune the bin at the mid point between the limits. In the above case of a bin range of 1000-1500 rpms, I should tune at 1250 rpms to best cover the spread range.

Am I on the right track here?

Frank