I have been flying my old 900 Series kits with the Guillow's D 6 propeller. I'm going to try and build the kit specifically for the D 6 propeller. Test flights with the Guillow's D 6 propeller seem promising.
http://youtu.be/-_urk_aAS8o
I will start at the tail and will try to make as lite weight as possible. Been awhile since I posted pics hope I remember how.