Derek Cohen (in Perth, Australia)
... all this is about as opposite to my experience as can be.

* the BU plane would need more wax more often

I use these planes as well. I have extensive experience with BU planes, and sticky is very far from the description I would use. In fact, I have described them as having a low centre of effort and that this facilitates less force being needed compared to BD planes (with the same cutting angle).

Regards from Perth

Derek