Yeah thats a big drop in pressure, especially for a 150. Although where the idle set would best understand how much the overall pressure should drop for your setup. Meaning, 3-5 psi is usually max for a 150 and 1/2" lines with JIC fittings. Using the OEM line and/or banjo fittings will always result in poor volume and unstable pressure. The fuel filter housing doesnt restrict any unless you're after massive fueling for massive power.
I run a 100 with an EZ and 275's and see about a 4 psi drop from idle to WOT. But I have all 1/2" lines and JIC fittings. I even use the OEM fuel filter housing for sake of the WIF sensor and the fuel heater.
As for a p-pump..... You may want to reconsider that. Yes there's plenty of people who've done this, but its very expensive and effectively converts the wide power curve of the 24 valve into the narrow 12 valve power curve without all the advantages of customizable electronics. Plus you loose some other related electronics as well. I'm not downplaying a p-pump conversion either but merely saying that doing so is not all roses.
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