I would say that is not accurate at all. A true liquid soap with a ph that low would have started to break down - causing cloudiness and layers. Soap is supposed to be on the alkaline side - that is what makes it soap.
Personally, I do not use strips but instead phenolphthalein drops and a digital (and easily calibrated) Ph meter.
What do you mean you added Avocado Oil to "help it along"?