Here is the update for anyone interested. I bit the bullet and had a tech from the Nissan dealer come out with a laptop. It turned out that our fuel pressure from the regulator was 28 kPa (about 4 psi) measured with the fuel pressure sensor, he tapped out the dirty LP fuel filter just prior to the regulator, and got us up to 33 kPa which let it start and run great. 35 kPa is spec (just over 5 psi) which a new filter I have ordered should get us too. Now- it sure doesn't seem to make sense, especially since it ran great if you got it started, but that was the cure. I'm glad to have it running!!
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