Using the onscreen SteamVR seetings utility?

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Recently I cleanly reinstalled The Pitool for my Pimax5K+, but in doing so I messed up the settings using the onscreen utility.Now I can't quite figure out how to get my best settings back in a compromise between FPS ( I'll settle for high 20's until I buy a better graphics card..)  and super clarity. I had this before. I remember setting up Resolution per Eye, in General settings ...So say I do about 100 using the Custom option. Then I go down to Video settings and I get just about the same settings I just did in General settings.Then I click on Per-Applications Video Setting and I get a new screen which allowas me to Manage video settings starting with SteamVR Home usisng the slider to increase or decrease the Mutiplier.I can also manage Battle of Stalingrad using the slider to say 120 or so. The higher I go the better the clarity in game but a very bad drop in FPS to about 10( If I dod only default settings I get great FPs but pretty fuzzy clarity.) There must be a way to best set up this utility to work towards a better compromise? I need some solid advice?

( Oh I also can't find a way to set "Vertical Resolution" as recommended by Ferris Wolf in his excellent recommendations...

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Solved ( I think...) through hit or miss experimentation..