Trying to Figure Out the Child Growth Rate Formula: Could someone do this test please?

[astrophys]

I believe that testing the child seal of Elise!Lutz would provide a great insight as to how it works.

Arthur has a 5% personal luck growth, Elise has a 70% growth, and Lutz has a 75% growth

If growths work like in Awakening, Lutz should have a 50% growth rate. (5+70+75 = 150; 150/3 = 50).

If growths work with just the variable parent and kid's average, it should be a 72.5% growth rate (70+75 = 145; 145/2 = 72.5).

As such, there would be a 22.5% growth rate difference between the two possibilities.

This is considerably more dramatic than other cases I've been able to test (by looking at people's youtube videos) before, such as Elise!Kisaragi's magic growth (65% Elise, 0% Takumi, 0% Kisaragi); these predicted 21.66% in the first case and 32.5% in the second case, so the difference between these scenarios was 10.8333% in growths.

So, in other words, Elise!Lutz would be a much better diagnosis of growth rates.

One catch is that his growth is so large that promoting from Wyvern Rider to Wyvern Lord would be hitting the caps always with a child seal; there is a 9 luck difference between them, and the promotion bonus is +1. You'd get 8.5 luck at 50% luck growth for 17 level.

So, instead, the question is how many levels it takes to max him out. He gains 1 luck from promotion, (from having capped out as a Wyvern, so his growths presumably wouldn't help him as he'd be unable to gain such levels when unpromoted).

So he has 8 luck left to gain then.

If it works like Awakening, he should take 8/.5 = 16 levels on average to cap out luck.

If it works like the average of Elise and Lutz's growths, he should take 11.03 levels to cap out luck, on average.

Could someone test this?