Hey Mate

Generally all kites run off a system where as long as the line length of the 4 /5 lines is all the same then you are sweet to go.

The line length is the most important thing as this sets the power differential on the kite.

If the back lines are two short you stall the kite.

Using another bar or even one bar will make no difference unless you are talking about a small bar for both a 7m and 11m. The difference then is a short bar makes kite turn lower.

Hope this helps out.

hey stretch
try these guys, they reply in a day or two
http://www.cabrinhakites.com/ask-a-question.html

my 12m SB3 (2008) flew fine off the bar from a 2010 9m nomad. their advice was not to but with the SB's huge depower there was no safety issue.

havent tried the other way around, but as the 08 bar flags the kite to a single line i would have thought it was ok.

good luck with it