Growth chance randomizer - how does this work?

Hi there!
I have been testing this on single player because I wondered which can get the best outcome for vit/str/agi stats.
For now I have on official a sand reaper queen that turned out pretty nice despite having average to low growth chance.
On single player I summoned 30 more sand reaper queens, made all of them level 20 but non of them had good growth chance in more than 1 of those 3 main stats. I consider good if it is 70%+
Is this something that has been made impossible?
Would be nice to get a better understanding into this so at least I know which pets might be worth getting.

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