Does anyone have a plumbing schematic for how Formula plumbs the Latham steering in a 353 fastec with 525's?

It appears the starboard engine is main power for steering system but the port one is also tied in somehow.
Ran port motor for like 2 mins on hose today and fluid level in that reservoir dropped some and the reservoir on starboard motor was blowing fluid out the cap.

While running the Port engine, I didn't touch the steering wheel at all so not sure whats going on here but its making one hell of a mess!

Any help would be greatly appreciated.