I guess it did but the front ones were on continuous beep by the time I got close to the Mini because I had 2 big cars either side (no more than a foot and a half apart on both sides) of me and I was paying more attention to not hitting my nose off the one on my left side as I was turning while reversing and she was slightly less than the X5's length behind me.

Don't know about anyone else, it might be my hearing, but once the front ones are on continuous beep, I can't distinguish between them and the rear ones.

Once I left my details it took me about a 7 point turn to eventually get out

yes, but 3000/5000 = 3/5, so in this example say I attribute a value of 5 to the Mini's damage, I would have expected the X5's damage value to be 3, not 0.001