Hi Gerald,

I think you're right, that the effect of airspeed on the downwash can wreck the "lock in". I had a discussion with Ivan Kristensen about a year ago on this subject, and he mentioned a similar trait. So...

On my upcoming (.90 to 1.20 size) pattern plane, ( http://www.nextcraft.com/j45.html ) I've done what you suggested, and have the stab 1 inch higher than the wing. (image attached)