How should I install extra ballast in my boat???

Hello everyone,
I have been doing A LOT of research on this matter and I have browsed many ballast upgrade posts on this forum, but I was hoping some of you could help me make up my mind.

Essentially I am going to do a lot of this the same way, but I am wondering if I should do it the way FlyHIGH does it, using valves to route the input from the hardtank to the soft tanks, or the way WAKEMAKERS does it, using the hardtank overflows to fill the soft tanks. If I do it the FLYHIGH way with valves, I will splice the soft tank into the the hardtank overflow hose.

For example, in the picture below, it shows how I am going to route the hoses for the two forward bags. Where it says "To Manifold" that will either be FROM the overflow (vent line), or from a valve that routes water directly from the pump in the rear of the boat.

I was also considering using a valve for the front bags, and just the overflow technique for the rear bags.

I really appreciate any help/insight on this matter.

Thanks,
Chris