That was not aproblem on my  pattern setup   maybe I will pull out the old pics and copy digitally
   I had very low wing loading soa very low  difference in pressures.
 The pure mechanics tho of pusher is  typically a bag of  compromise after compromise. The  Rutan stuff  was  darn good 
BUT if you flat spun those setups be preparred  to  use  the parachute.
 
 Like the  old Ercoupe 
 "you can't spin em " However if you happen to  spin one - get out.