Honestly, pH testing is not worth your while with soap. Knowing the pH doesn't tell you whether the soap is lye-heavy, as so many folks mistakenly believe. Also, the strips will be inaccurate - often 2-3 points lower than the actual pH. True soap has to be above 9 pH; if you try to reduce it lower than that, it will break apart and become a gooey mess of fatty acids.
Fresh, uncured soap is going to be harsh on the skin for sure, but even more so with high coconut oil. CO may be moisturizing in its raw form, but it becomes very cleansing when it saponifies. The "cleansing" number in the
soap calculator refers to how much oil it strips from your skin. A high superfat can help counteract that, but lowering the cleansing value of the soap will help a lot more. Even if the soap has a 0 cleansing value (like 100% OO or lard soap) it will clean your skin - just not as aggressively.
This is one area where I believe all
soap calculators are so unhelpful, as they recommend a cleansing value between 12 and 22. Many new soap makers think, "Oh, if I get it to 17, that's right in the middle, so that should be perfect." That much cleansing would have me peeling profusely after the first use! The same is true for many folks who make their own soap because their skin is so sensitive. I personally love to keep the cleansing value at 15 or below - 10-12 is actually a sweet spot for me.