i know there are some nice people around here to help out in german.
But, first i would check that your mouse saves to on-board memory and not to the pc. check using the logitech software, its a big switch on the first opened page. this isnt your mouse but should be the same. you can set custom colors to the profiles you configure to verify your settings once you connect with the XIM

next note: high sensitivity is extremely helpful with destiny to help combat the super high aim assist in game. RML has the great suggestion of using as high sensitivity as you can while still being controllable. that doesnt mean you will be comfortable with it at first, but you will get used to it.