KBGhost,
my best advice is to try it and see for yourself. You may or may not notice any difference in handling or performance.
Reading on your North 2020 Bar specs, I found this:
ADJUSTABLE LENGTH FLYING LINES 22M (12M + 10M)22m lines have a split at 12m, which is far enough for the bar to travel to completely depower our largest kite when you flag out. Remove the standard 10m top section of flying line and 12m lines are ideal for schools to teach with and for foil racing. 8m and NEW 6m line extensions are available as an accessory for wave riding or tighter kiteloops.
This means you can easily adjust your bar to a high V using nothing more than a single stainless steel O-Ring. If you don't have one you can get it at Whitworths marine here:
www.whitworths.com.au/stainless-steel-ring The procedure to do this is explained in detail in this Airush video below:
hope this helps
Christian