The 20 wont change no matter what you do with that dial, the 30 would be out slighlt, the 40 a bit more and the 50 a bit more yet. If you use the 50 or even the forty to adjust that dial your 30 will get a bit tighter too. To knock the 50 out an inch or two will have minimal effects on the 30 and no affect what-so-ever on the 20.
Keep up the great shooting Jason! A nice calm day will let you know whats happening.