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Soil pH of Gritty Mix

I make the gritty mix as:

* 4 parts Turface MVP, filtering out the fines

* 3 parts fir bark, filtered

* 2 parts stone

The Turface should be pH neutral, as would be the stone. The fir bark is going to be acidic. By itself, I measure the pH of the fir bark around 4.5.

When I mix the above and test pH I get around 5.0, so quite acidic. I thought the gritty mix was supposed to be closer to pH neutral? This leads to the following questions:

* How will most succulents do in a slightly acidic soil (pH=5)?

* Should I be adding some dolomite lime to my gritty mix to bring it to pH neutral (~6.5)?

I am testing pH by putting the soil in a chemistry flask, adding distilled water right to the top of the soil line, then waiting 30 minutes. I test the liquid with pH paper.

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