I have a 2011 R and originally went to .64 springs (with a Superplush revalve) and found that they were still to soft in hard braking and hard, rugged terrain. Went to ;70's and fixed the problem. Much better off road and particularly good on the street. The front end stays up and doesn't dive under hard braking.
If you want to try the .64's let me know and I will try to figure out how to get them to you.