Which option for most improved pwer delivery?

3K is too high for those gears. You may like the acceleration, but the respoonse and cruise will be spongy for a street car. I would up the cam to the EX268, and buy a set of smaller diameter slicks. Not worth changing gears for 1/3 of a rotation. Really, I would have thought you'd be close to 13s now. How far away is it?