Steve, read what you are typing here. You keep messing with the idle air screws trying to stop surging on the road. IDLE screws are not on the POWER circuit. They are on the idle circuit. They have purt near zero effect above idle. You need to set them to the highest vacuum reading at idle and LOCK them down and fuggetaboutum. You need to concentrate on the primary power circuit. The metering rods. I think you've nailed the springs. You just need to swap in some smaller rods and fatten it up.