I just got it to boot from wm6.5 using the same sdcard used previously for dual booting.
Just added clrcad,haret and startup.txt from an sd build.
Edited startup.txt "rel_path=NativeSD" and deleted "data_size=256"
Edit; Data not working but I guess we are waiting for PPP update, wifi works
Edit2; scratch that data working ok, just took time to show itself.
Will try to start from clean sd and install recovery
Can you zip up these files and post them ?