Bone-weighting not imported correctly

Hello,

When I've imported my rigged, bone based model into Unity frome Cinema4d and go into the config for humanoid animation, Unity seems to ignore or rewrite the weighting to my chest and spine bone i've created in C4d. I wasnt able to Import an animation from c4d until yet, so i cant say if the weighting in unity also affect the animations, but i think if this Problem isnt fixed, i could have Problem later on when i want for example dynamic effects on bones like falling that are not animated.

i tried fbx6, fbx2010, c4d everytime the same result even for the animations (also tried to bake but thats another topic)

also the weighting for the upper arms are not correct:

i would be very thankful for your help (sry for translation mistakes im german)