To hook up the fans to make them ECU controlled you need to use plug F47, wire 17. This is an earth switched wire, same as the stock EA radiator thermo switch. You can wire it straight into that factory wiring if you've got your fans hooked into that, just make sure it's NOT on the earth wire side of the radiator switch
With the ECU controlling the thermo fans they should switch on and off as needed. If they're on all the time you need a new temp sensor - the brown plug, two wire unit on the coolant crossover pipe under the intake manifold - it's a PITA to get to!
I'm still working on my radiator situation too. Your setup looks neat - I personally wouldn't worry about it, after having seen the pics I think it's neat and effective.
If you don't want 5 lug anymore "feel free" to ship the rear end setup to me!!