How are you measuring pH? Digital meters will lie at some point. They don’t last long even with proper care. 400 ppm is fairly hard but there’s much worse out there. You may want to filter it a bit to get it under 300. It will be difficult to maintain an acidic pH with high calcium (alkaline) water. Cheap pH down would mainly consist of…

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A seedling is in the vegetative state as soon as it’s born. It takes about a month for a seedling to become sexually mature in any situation. Doesn’t mean it’s going to ever show it’s sex in veg. Seedlings are initially provided nutrition through their embryonic sac, so they don’t need nutrients for about the first 10-21 days depending on the cultivar.

I’d let it go another week. I’ve heard that sometimes they need flipped to 12/12 but haven’t had to do this with any of mine yet. Some of them just veg longer. I recently had one well into week 6 before flowering.