Nice test, krik. I was about to do another..oh wow, I learned something new!, but I'd always maxed growth on the turn I avoid growth assuming it would actually max the growth. Think I tested that a long time ago.
I think for me, I've never fully reconciled the food overflow, especially when the granary is not yet full. Assuming no avoid growth turn, what happens with surplus food on turn of growth.
Oh..in your particular test krikav, what happens if you just grow without avoid growth, using pigs and the +6 food surplus, or +5, whatever it is?