Anyways, the solution for me is to ALWAYS have only ONE pipe from boiler to consumer where possible.
Having larger pipes also seems to mitigate any such issues for me because there’s always room for excess to move rather than it being restricted. Though the opposite could be true, restriction means there’s only one direction the fluid can be moved, eliminating sloshing.
If i need 3 or more boilers of some type then i re-think the setup completely and replace those boilers with a stronger one instead.
That is, those two boilers you are using could (in theory, in practice they can’t) be replaced with one 384 steam/t boiler.
I assume you want a steady 128 ru/t output, right?
Since there’s no “batteries” on any steam based setup short of a dynamo setup, you’d be better off using another means of energy generation. Such as diesel engines (and gearboxes if necessary) instead of steam.
Steam past the early days of GT is completely useless until you can do the large steam->dynamo setups.