Thanks for your help, I can now record non stop in hacked mode(i have done a 30 sec test with the logo in green, so it's ok for me).I Think the problem was global draw on, and raw+L instead of raw only in photo mode.
benchmark CF only: 87Mb/s max
benchmark CF+SD: 82 + 16Mb/s
This lexar card is a lot slower than yours...
If the question was for me mixmastermike, my firmware is 1.1.3.