Page 50 of the Sniper xflow manual says the idle, cruise and W.F.O. timing will "be blended together automatically". If you hook it up to a laptop, and have someone available with the know how, you may be able to improve upon it for your application. It also says that changing one of the values will raise or lower the curve in that area. I figured they took engine vacuum and r.p.m. into consideration when making the "curve"