Re: The beginnings...
The only problem with a herbie on your setup is that you have a manifold, the trickle down the durso (I still call it an emergency) drain will vary greatly all the time because of things added onto the manifold. For example the reactors slowly clog up and get slower throughout the week, forcing the durso to handle more of the draining. This could be a problem if it can't handle all the flow from your main siphon getting clogged and the clogged/slowed equipment on the manifold. It all depends on how much flow your durso (emergency) can handle.
With full siphon setups you only what the drains to be submersed an inch or so under the water in the sump so it can purge all the air, taking this idea and reducing the pipe size may solve your problem without redoing everything. Or angling the drain, I can see this helping to an extent but their may still be splashing when it hits.