Beware pump gauges that lie too... I have some that are not calibrated properly.
The efficient high end kites are pushing the limits of structural support, and on full depower their support is drastically reduced with half the laminar flow detached. You are asking a lot of it! Better handling, efficiency and manoeuvrability using a kite inside it's windrange..
I used to take some kites to 9-10 psi, until the pump struggled to push more air on some of the very early kites (pure bows), since then they are a lot more stable with a lot less pressure.
A while ago I did see one chap out with such a big kite, and de-powered so much that it's forward drive was less than it's drag, thus is was falling back in the window when he was up and riding. No deformation, he just could not produce enough drive to overcome the drag and was asking why his kite was not working properly..
De-power is a luxury, not a right
use it responsibly