Sorry about your loss Ales,
I'm flying my ustick 60 and was also told by my instructor to throttle down on the downlines
in order to not stress the airframe more than necessary.
a little glassing on the underside of the wing also adds some more strength against
the mostly positive g-forces.
I crushed my wing in the middle when i tried to push the servo in and the wingtips when i closed the rooftop
of my miata. guess it didn't fit right but after removing the covering i found out that they used some kind of
hotglue or else and not applied consistantly to all surfaces. Who knows how much glue is in there anyways.
I'd give hangar 9 a call and see if they give you options.
good luck, pat