I found the OnTouchedByEntity in a plugin where someone touches a laser or something but not sure if that was valid anyways. => here:
https://forums.alliedmods.net/showthread.php?t=156431
But thanks Marttt for the sdk_hooktouch, that did the trick and is rather simple!
I just hook the container now check if bot touches it, if so I set the unstick 0 and unhook
then after event stops I just set unstick back to 1.
That seems to solve my problems!
Final result attached...
Thx a ton!