You're overthinking it
Try this:
OSC 015/015 ON/OFF Then PM1 ON
If Timer PM1 = ON Then PM2 ON
If Timer PM1 = OFF Then PM2 OFF
If Timer PM1 = ON Then PM3 OFF
If Timer PM1 = OFF Then PM3 ON
If Timer PM1 = ON Then PM4 OFF
If Timer PM1 = OFF Then PM4 ON
This is as simple as you can do it - by making 1 pump the "master" and having the state of each of the other pumps spend directly on the state of the master. PM2 will do exactly what PM1 is doing. PM3 & 4 will do exactly the opposite of PM1.