Stability increasing "junk" doesn't have to be the same things, crystal clusters, mob heads and candles all work the same.
Tubes connected to each other cannot contain multiple different essences and multiple jars cannot be pulling essentia at the same time either. You can use valves to control connections but it gets tricky. If you're doing it manually I find it is just easier to right click with phials/jars on the alembics directly. If you need some specific aspects automated you should make a separate setup with up to 4 alembics with tubes on all sides for all of them (because randomness in the system puts essentias in different alembics all the time) and label all of the tubes to only hold one kind on each side. That way it shouldn't break. Or just use golems, they're probably way simpler to use for that.
So the only advantage crystal clusters give is that they can be placed on ceilings and walls? And that a head can be opposite to a candle and still stabilize? So you can have an altar that looks like the back dumpster of a shonky morge and a candle shop and still have a stable altar? So long as they follow a similar pattern.
Also I know all that stuff about essentia tubes but I still can't figure out how to make an on demand essentia for the thaumatorium.
Either the system is designed to never be capable of that or no one yet understands how to do it yet.
It's the inability to easily clear essentia gumming up the tubes that gets me. Stop an achemy craft and the system gumms up. Also how buffers tend to block suction from essentia requestors.
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