Well - I decided to just show up at an RV service center and act the part of an innocent lady and act dumb. They took pity on me, but still took them 1 1/2 hours to figure it out. Decided the filter was getting air in somehow, and it was maybe pinching the line having it horizontal instead of vertical. I still think the pressure isn't as great as it could be, but it is enough that the hot water tank is firing up, and I will be able to shower when we head out for our first long week trip