I always used spring water for my tanks, and I never had any pH issues. Maybe you could try that? Your cycling is definitely the longest process I've seen. You do seem to mess with your water parameters an awful lot though. Patience is important. What "major water change" are you referring to? Since you are doing a fishless cycle I would not add fish until you've got things under control.
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Phishie
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"An ounce of prevention is worth a pound of cure."

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