Speed 2 alternative balance.
A previous path improved speed 2 quality a little but more extensive testing showed that it slowed encode by a few %. The change will have a similar effect for speed 3 but should not impact speeds 4+; This experiment should reverse that and give a speed up at the cost of a small quality loss. Borg results pending. Change-Id: I4493fc1541aaf44587f1a41ff219f7088da9252c