You could use the proportioning valve to the left front and use it to control the amount of push into the turn.
Middle of turn push: The cures are similar to the loose in condition. Tire stagger, tire pressure in right rear or cross weight seem to be the general culprit according to my books. If you are running in the top 3 and most of the others are loose on entry, then you may just have to live with a certain amount of that. If you use a proportioning valve to the left front, you may want to use the screw type (opposed to lever type) to more closely dial in the amount of push on entry. The lever type proportioning valve may be too much as they are preset amounts for each click.
Steve