What do you use for valve automation? Is it a commercial or custom part? I've been wanting to do the same myself, but I hear there's all sorts of quality issues with automatic valves.
The usual sprinkler valves at hardware stores need quite a bit of water pressure to change state which is probably what most people have a problem with, especially if they're trying to feed them with the kind of pumps they get at hydroponic stores.
[1] https://www.amazon.com/Motorized-Stainless-Electrical-U-S-So...
I use standard 3/4” sprinkler valves from the big box stores, connected to a manifold via unions on each side. This enables me to swap if needed, but these are ruggedized and will last a while. They do take 12VAC, so you need a transformer and use relays to turn them on, but they work very well.