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Maybe a restrictor on the high pressure side is required. I noticed when going from OEM banjo bolt configuration to aftermarket braided hose my PS suddenly whines as well, and the rack is sweating fluid. I think it needs a restriction at the pump to lower the pressure.
I think Air bubbles can form from "nowhere" if the pump cavitates. I would say that if air is appearing, then obviously it is either entering from somewhere, or the pump is introducing them through cavitation.
I am Not a PS / fluid dynamics expert and my theories are just guesses, kind of hoping someone who has done this will comment on the fluid pressure, restrictors, etc.. because I myself would really like to figure this out once and for all without having to do my own experimentation / wasting money trying to figure it out.
If I had the tools I would measure the pressure on a stock pump/line system, and compare it to mine for starters, for example. But those tools cost $$$
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