Switched my pull type spreader from Raven ISO control to Deere dry rate control as I am running a 2630. l. I have a PWM valve controlling the spinners. What valve cal should I use? In the Raven it had both valve cal and meter cal for this valve. Valve cal of 43 and meter cal of 20. Somewhere I read that deere should use a 1533 for starters. I have tried that but the fans won't settle down. I had a few glitches with the valve on the Raven system and am wondering if the valve is going bad? Any ideas? Thanks.