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I don't mean to be contridictory, but I have run a 4 way manifold at 20 to 25 PSI without any problem.
I use this one

The only time I had to go higher was when I went to an 8 bank manifold, and that was just under 30ppm, not 35 or 40.

There are other factors that lead to the path of least resistance, micro leaks in the tubing, leaks in the fittings, leaks in the manifold, blockage in the manifold, the distance of each line... re ajusting each needle valve can help. Slowly open the needle valves in succession starting with the firt one, opening each one full open before opening the next. Then ajust them down.
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