No, powerspike is not what makes some kites jump higher and longer.
It is the ability to redirect, combined with lift on the profile, and somewhat AR influences too.
So a fast flying kite with no grunt and lots of depower, typically wave kites (okay, one of two wavetypes, the other is the grunty ones sitting deep), dont jump well and drop like a rock.
Interesting why we have so different experiences on this, powerspike of the Peak4
Will see over time how it works out, but for me the rapid powerspike on demand, and especially the ability to STOP the spike almost instantly, is key for me.
Closed cell foils more powerspike, definitely, but LEIs, I dont see this happening.
If a freestyle almost C like kite, yes the loop might have more spike, but for depower wavekites I find the Peaks got more peak
Using 21 m lines with high V and not a thick frontline so not much drag.
Havent ridden with other linelengths though.
Peter