I'll tell you my experience with my 07. I was leaving at 5500 and was having quite a bit of trouble keeping the front down, note pic in sig, with a four inch stretch. My 60's were in the 1.65 range. I started leaving at 3500 and just almost dumping the clutch. The bike will actually slightly bog a bit, but pulls out very quickly. My 60's have dropped to 1.57-1.60's and I picked up 2.5 tenths in the quarter. I know it sounds counter intuitive, but just give it a try.
If you have a strap, pull it tight, then let it off about a half inch. Of course, your weight and style will differ and require some changes from my setup, but it's a starting point.