On carpet, I just ran a standard front diff. There are many things you can do to get more steering but a spool will generally have a little less initial turn in, especially if you are hard on the brakes. Anti-dive in the front will give you less initial turn in and more on power steering. If you are looking for more turn in, I would try; rear anti-squat, raise the rear roll center, lower the front roll center, shorten the front camber links, stand up the shocks and more front droop. All of those things should give you more steering into the corner. Hope that helps.