Hey Nick
I would keep everything as simple as possible, first decide on the size of pump you want, that will determing the inlet into the 4 way, lets suppose you go with a 1200 gph pump with a 1" outlet, get the 4 way with the 1 inch inlet.
If you run four 1" pipes to the tank then you can use the drum that simply sequences 1thru4, if you prefer to drop to 3/4" pipes then you need either version 2 or 3 to allow the pump to do it's job, no point in buying a 1200 gph pump and choking it.
Looking at the pics I think you have a little too much going on, I would like to see it cleaner, you need to be able to hide as much as possible, I would be inclined to run version 3 drum, run outlet 1 to the right side of the tank pointing to the left, outlet 3 would feed a 360degree rev in the middle of the tank, outlet 2 could go to your spraybar, or to another 360 rev, and 4 would go to the left side of the tank.
when water exits from the right it will be deflected randomly by the rev that is on at the same time, if you use 2 revs the same thing will happen when water exits from the left, it's up to you what you use, I can only give you some alternatives.
If you feel the flow is a little much then open up the drum a little more to reduce the flow equally, better than turning down the pump.
hope this helps
Paul