I have a big problem with my homemade rev kites. My hobby is making kites, so i' ve made two rev kites. One is 2 m for fun, and other is 3m for power. Both flies great, but big problem is with the place where vertical spars connecting with leading edge

The vertical spars are rubbing on dacron sleeve making holes in dacron, also rubbing on leading edge spar so badly, especially on power kite. After 4 hours of flying horizontal spar walls was rubbed on half of their thickness

So i've checked plenty pictures with original rev kites, and i didn't see the solution, because they also have a simple dacron sleeve for leading edge with extra dacron on connection points with vertical spars, same as me, but mine kites have this problem with rubbing.

Maybe on original kites they use different material fabrics under connecting points? How can i sort this problem out?
And do i need to use bungees on top connecting points of vertical spars, or i can use just a line?- asking, because one of my versions about that problem is: top side of vertical spars at the moment are on bungees, maybe there is too much motion and flexability, so static connection with line wil help?!
If somebody knows what to do, please tell me!
Thanks a lot, and have a nice windy days!

Kristaps.