Test with 50x50 softbox about 35-40degto camera axis on white target and 5 ft from target - back

camera f8    
softbox f8 softbox f11 softbox f5.6
minor bg bleed shows bleed into bg  

 

Move softbox to about 50 deg

camera f8    
softbox f5.6 softbox f8 softbox f11

 

Focussing projector used to illuminate edge of white target - background only reflects when angle close to camera axis

camera f8       flash + 2stops
15deg to axis 7-8deg close to camera axis 7-8 deg 7-8 deg
bg black bg reflects bg blown    

 

Showing focussed and unfocussed gel

unfocussed orange gel focussed red gel at min bg flash at max bg flash
     

 

and finally my first serious go - all alignment to heck !