I have never found Chromaphyos to give a darn about pH. In that, they are like all other killifish.
What they don't like is ammonia, and that is often higher at high pH, but negligible in well-planted tanks or tanks that have frequent water changes and well-aged biofilters. They will readily reproduce at pH above 8, but not if the ammonia isn't 100% removed, somehow.
[BTW, don't go out and buy an ammonium/ammonia kit. We are talking hundreds of times lower levels than they can hope to measure.]
Another thing I have found interferes with reproduction is high amounts of the divalent ions, like Calcium and Magnesium. Apparently high GH hardens the chorion or something, and makes hatching difficult or impossible. I would suggest adding RO or distilled water, if your GH is much above about 8 or 10 degrees. You can try to soften the water with zeolite or peat, but may need to add a bit of potassium to balance out the increased sodium that results.
My advice is to stop fussing over pH, which doesn't ever have any direct effect, and pay attention to fixing the things that are important.
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