High Alpha flight is going to get you - no matter where the stab is placed .
On a model anyway -I don't fly the BAC111 so - I am only guessing on that one
last Sunday - a friend was flying my scale model of a 260 Extra - doing high alpha flight right over the runway -at about 30-40 ft and the engine abruptly quit ( fuel tank disloged and fuel flow stopped .)
He had no chance to drop the nose and regain forward speed so -he just held full up (about 50 degrees on elevators)
The model weighing 13 lbs - on 1150 sq inches - simply fell absolutely flat - with no more than 30 ft forward flight -right to the runway. This drove tailwheel into rudder - mains thru fuselage engine upward etc..
,It showed - again -that stabilized high sink rates -which look like a controlled descent - are really killers .
On our foamies the inertia is so low -they just thump down with no damage. but same thing on angles almost vertical drop -
I don't se how stab placement could help/hinder this .
The business of downwash effect on the models is really far over imagined -in my book.