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2. Install a bleed line around the pressure regulator with a small metering orifice (.020-.030") that would bleed off any air that might get trapped. (This appears to be the solution the Subaru group is focusing on). This would be a full time bypass. This seems to be the simpler solution.
What is better than an orifice, is a larger orifice with a piece if wire through it. A single piece of crud can plug an orifice, but the orifice with the wire though it is quite difficult to plug up. They use this trick on expensive pressure gauges to limit surges.
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