Strange and frustrating mesh deformation in exported collada animation

Hi and thank you very much for any help!
I have a working animation that work perfect on blender, but when exported to collada it have strange behaviour… I did the armour two times, tweaked every thing I could think, tried a lot of different solucions I seen on the web, I even use Rigify to buid a new armature… nothing worked… … I was very excited but I been one week stuck on this… :confused:

Any clue??? Thank so much!!!

any information about it? I’m in the same situation and I haven’t found any clue about it. I think it could be about some deformation due to Rigify metarig, couldn’t it?