For me 72 kg 12m is for light wind or 22 knots airstyle. So this kite is no airstyle no more just light wind. I went out on a 7' foot surfboard and the kite had more pull for sure when the wind dropped off to 6-8 knots the kite didn't. Overall the kite lost it's range. It works well in steady light wind with no big bar movements. It's a keeper for light wind.
do you have picture of your newly became strutless kite in the air? i'm pretty sure its canopy is folding near the leading edge. you can not have nice powerful wing profile with thin airush vapor leading edge without the struts.
for strutless wing you have to have thick leading edge which is acting as the front part of the wings profile.
and why can't you repair the struts for yourself? struts are the easiest part