All I can add is your second valve ( the Char Lynn ) looks to be around 3.5 cubic inch disaplacement judging on the size of the snout.
Mine are 4.5 inch witch gives me a 4 turns lock to lock ( ruffly ). If you increese the size of the snout it it increeses the amount of fluid the valve can pass.
Here's the specs on "mine" http://www.midweststeering.com/index...id=1&parent=62
Mine where pulled from frok trucks and they are open center and NON load reactive.
Valves are tricky, you really should find out what its specs are before installing one, but the nice thing about them is if you do install one thats not working or the wrong type the mounting is normally all the same along with the plumbing, just sucks to break open a sealled system.