My 2cents. I think 1 problem is adding ZDDP or Polybutene or whatever is not the only addition. We (you) can only get it as an additive to something else, unless you get a few metric tons or barrels. Felix and other lubes have known ingredients with known (?) characteristics.
I did look into the characteristics of the polybutene. It breaks down with pressure and heat to a non-tacky, non-lube 'stuff'; i.e. works for initial bang and then is kaput? No way to verify this. Another comment I see a lot is that vegetable oils don't work. They take temp and pressure better than mineral oils. Problem with oxidation? Yes, but how long does this take? I shot 30-30 loads left in the garage this Texas summer for > 1 month, through a bbl uncleaned for 1 month. Doesn't kill the powder that I can tell. POI was just HIGH. Yes, a fog comes out the muzzle. Even in 308 AR, the action is easy to clean, minimal blow back. Low viscosity and good VI. It may not be the best but it does work, doesn't shoot right or left like LLA, recluse, peanut butter (which works fine but is messy hand lubing). Quit the fairy tales, there only good for kids.
My addition to the list, although it doesn't fit your method, would be to lose the lubrisizer. I would guess that 50% of those on this forum don't have one and don't intend to get one. NOT meant as a negative statement at all. Respectfully to those doing the testing, you appear to be getting some good results, can this be applied to the rest of us?