Just a thought did you check the filters? theres two.
Question for you Jack how were you getting 1300 lbs with a 1000 lb relief valve or was that Tom with the 1300 lbs lot of the tour operator that don't do much city driving like the lower pressure for the highway driving I removed 2000 lbs valves and replaced with a 1500 lb valve,the mountain,snow and ice drivers just like a little assist they prefer not to have easy power steering but snow and ice driving is not a problem in FL lol glad you made it work good luck