Altitude plays a big part. You shouldn't change the pilot jet and the main at the same time though. Make each step individually, so you can see the results of each change. What elevation are you at? I would think you are too rich. You are still running the air box, right? Lid on or off? What is your current jetting? You said you had 300 mains, and were going to put 30 pilots in. Are they 25's now?