Some of us who've been doing it for years (albeit intermittently in my case) - come a cropper once in a while. In my case in this grow - thrips; light leaks - stealth bananas - seeds; bud rot; and what looks a bit like
virus in my most troublesome pheno .. but the harvest will still be sufficient to guarantee normalisation until the next harvest.
That's a key point - 14 weeks from seed to harvest

out in the garden you have to wait till next year.
Growing plants close together in a cupboard is a particular kind of challenge.
One thing I've just discovered is "staggered fan stacking"

.. it seems hot moist air can be reluctant to rise above hot reflectors so I now have a fan at lamp level blowing upwards.
I appear now to have the beginnings of a draught from the intake at ground level, up through the foliage ...