Years ago, I used only spit as well, Forrest. Then Harry N. wrote his spitter had pretty much dried up and he could not produce enough, any more. Now I've reached my senior years, I am finding this out for my self. Thus, for plinking or trail walks, I usually use WWWF + a bit of oil. The oil is to reduce the evaporation in the summer time- whether that works or not, I do not know -- I do it any way & this lube shoots as well and with the same loads as spit.
If I use a slippery lube, like George's or LHV or Shenedoah lubes, I have to increase the charge 10gr. to get the same accuracy given by the water based lubes- WWWf or spit.
Make sure you check the load on a PAPER TARGET to see if you too have to change your previously good shooting load when switching back and forth between water and slippery.