After much observation my theory is that 5 of 6 stats are set to ceiling(stat max/10), and the 6th is an evenly distributed random value.

So for example, my core maxes at 23, so ceiling(max/10) = 3, so I get 3 5 times, and the 6th is a random value.

eg.
yesterday - 3 str 3 dex 3 int 3 luk 3 atk 7 matk
today - 3 str 3 dex 9 int 3 luk 3 atk 3 matk

When my max was under 20, I was getting 2 in 5 stats.

Anyone with 30+ maxes, but hasn't locked in their stats, want to chime in?