Individual value is a concept that was introduced long ago in the original game, while size is an original concept in the mod, and there is no relationship between the two concepts in the official setting, but in the egg hatching system, the genetics of size has borrowed some elements from the original game

Size doesn't affect the elf in any other way, so I'm sorry if you feel that the larger the size, the higher the individual. I'm sorry if you think the larger the size, the higher the individual, but that's probably just because the stats are small, and if you do a math analysis of a large set of stats, you'll see that it has nothing to do with that

I hope that helps

Here's what I mean.