David, I don't think the snapping noticeably depends on the vertical position of wing and stab. That's more a matter of belly pitch in knife-edge, what the originals were (still) not made for. Hanno "cheated" on his Dalotel by lowering the stab. (Just can't find the Dalotel thread here.)

Snapping surely depends on wing planform and airfoil, but I think wing loading is paramount. A small drive allows lighter structure and maybe even the same performance as the usual heavy models. Maybe it's just impossible to build a 40 size CAP light enough so you have to modify it somehow. I'm not impressed by the idea to build a small proof model, at least I wouldn't even try to fly it. I would expect substantial differences in flight behaviour to the bigger versions due to inevitable higher "relative" wing loading and Re number effects. Even the 1:4 version will and can not fly like the original. The test pilot reported a smooth and stable stall without wing dropping. As Deadstik said, the CAP model is a pilot's aircraft, meaning the pilot has to avoid slamming the sticks to their stops. A high-wing-loading model has to be flown quite fast and is not able to fly sharp corners - that's all.

You may read [link=http://www.eng-tips.com/viewthread.cfm?qid=183605&page=2]this[/link] and [link=http://www.eaa1000.av.org/technicl/onedesaf/1desaf.htm]this[/link] discussion of aerobatic airfoils to find very interesting characterizations. The flat-rear airfoils just give a sharp stall instead of a smooth stall of the NACA 4-digit series. I have a book with measured behavior of E168 and 169. For a small model you should use the thinner airfoil. The thicker one has more stall hysteresis and a soft stall with little lift at small Re numbers. Both have small drag over the whole AOA/lift range. So they should be really better than S8035 or NACA 0016, regardless of model size and wing loading. By the way, maximum thickness is at 25% / 27.9%, respectively.

Me seems your TOC size model would still be too small to come closer to the original, even at the ambitious low weight you specified. I think Hanno knew why he built his Dalotel to the maximum size allowed (and still "cheated" ), he just didn't tell it explicitely. You could cheat by reducing the taper ratio.