Chances of getting into King's College London

Hey there,

I’ve got two questions and would be glad if someone could help me.
I’m from germany and want to do my masters degree (Advanced Computing) in London (at King’s College).

One of my problems are the reference letters. Because here in germany we don’t have such a close contact to our professors both letters I got are very short (three to four sentences). Both professors wrote something like that I’m a very good student and reached the best possible grade in that specific course. However, they didn’t wrote something about my character or something else like that.
Since I work in an IT company I also could get a reference letter from my boss. He could write something about my character and about my achievments which are very good.
So which documents should I attach to my application to increase my chances?

Furthermore, I want to now how you estimate my chances getting into Kings College London concerning my grades.
The entry requirements is a bachelors degree with 2:1 honours degree - in germany that is an overall score of 2.0 out of 5.0.
Currently my overall score is between 1.5 and 1.8 but definitely lower than 2.0.

Do you think that I have a realistic chance getting into KCL?

Thanks!