I don't get the "baseline ratio" thing. Do you mean you want to dilute each type of LS to one set percentage of pure soap? Or do you want to dilute each one to a specific viscosity (thickness) regardless of the pure soap percentage? Or is there some tutorial or other reference you can provide to explain what you do mean in more detail.
As far as thickness goes, you won't ever get the coconut oil LS to have the same viscosity as olive oil LS by dilution alone, if you're wanting to dilute them to a honey-thick viscosity. Salt is also not likely work as a thickener on coconut LS. A gum or cellulose based thickener will most likely be required.
The pH of soap needs to be tested using a 1-10% dilution of soap in distilled water at room temperature using a calibrated pH meter. Otherwise the pH will test artificially low. Also pH test strips are usually inaccurate -- most give an artificially low reading.