It was so very hard to see how to even touch the exit. I'm 4 off, atm, will keep trying. Unbelievable level! :)
EDIT: 2 off, now. Can't see any better.
I think David's 65 here is fantastic. It took me 2 months, to find it. I was badly stuck at 69s, only today did I find a 67 and soon after the 65, as well.