Hey cubed
don't be dismayed, the 9m Rebel is a super sensational kite, but it does need proper tuning with the lines, as suggested by poor relative (again thanks for the kudos on my reports) these links all provide the information you need.
Definitely shorten the steering lines as my suggestions on the link for the 9m and the 7m. and most important pump that LE up rock hard. (you take your own risk above manufacturer spec, but 6psi is not enough) also those guages are really just a guide as my new pump has the pressure reading of like 12 psi when I know from experience it is really only 7. I pump my 7m Rebel up to 8 psi and the 9m Rebel to 7 at least, as I say your risk to do this I will not take blame if it bursts. 6psi in the 12m is correct.
On feel the kite LE should be drum tight.
It will fly like a dream with the LE wing tip pigtail shortening too
more info at www.southcentralkiteboarders.com go to equipment reviews
and
www.southcentralkiteboarders.com/rebeltune.htmlDaz