Hi all and thanks for input and for replacing the thread.
DAN: I already have Andy Lennons book and he prescribes a "static margin" of 25% MAC of main wing (Fig.8, p.104) which is heavy loading.
The calculator is a bit more "daring" with a static margin of only 5-15% of MAC, I have that one too in my ´puter.

Lnewqban: I have most of Andy Lennons articles already and he elaborates only very little on static margin in there.

So we are stuck with "conventional canard wisdom" so far.
Let me give you an example of one of my creations (see pic) which superstalled twice for me at a foreplane loading of 180%....[:@]..! One of the superstalls was even inverted..Quite a show but only two broken fins. Had to increase up to 200% loading before that monster stalled with a "mush" of the nose.
And that behaviour is exactly what I want to avoid with this new FSW canard - hence this thread and the aft flap.

BMatthews: I have played with the idea to have the battery pack moving on a slide back and forth but it is rather cumbersome and requires much space so I hesitate.
Keep info flowing....Cheers/Harald