i'm confused by what you mean by 'powerlines'. do you mean the front or back flying lines? given that there's a single knot on the end of the front lines (if you're using the Switch bar), i would assume you mean the back lines. but moving the connection closer to the LE on the back lines would only increase bar pressure. and there is only one knot on my Nitro off the back lines, though it's only a 10M...maybe the 14M has more. so can you better describe your scenario to lessen the bar pressure.
On the 14m Nitro you have two knots on your frontlines, the grey lines which you connect to the black lines, so not your steering lines.
If these knots are not on your frontlines (which I doubt) , just carefully try to add a knot on those connectors, makes your kite 's leading edge tilt forward a little and thus depowering your kite.
On my 14m Nitro the second knot away from the LEI, the first knot you meet when you run out your lines, helps a lot to reduce barpressure! But it also takes a lot of power out of your kite.