I noticed over the weekend (we have 10-12 maybe 14knots tops), I was using the 2:1 overdrive system on my Cabrinha and it was set to the highest bar pressure possible.
But because it "restricted" me pulling the bar in too much (chocking the kite), I was able to keep the kite powered as best possible and tack a few times. It was great.
Not knowing - I parked the kite, changed the bar to low pressure, but it hardly had any power and kept stalling.

So high bar pressure helps in not chocking a kite in light winds?

It is, if you're such a ham-fisted cro-magnon and don't have the sense to modulate or trim the bar correctly.