Man... this is one of the points, why Extinction Core is balanced for vanilla difficulty, means wild lvl 120-150. Primordials spawn at lvl 7 when using wild dino lvl 150, So if you double up difficulty to lvl 300, your primordials will spawn also with double lvl, what is 15 (14, if it would be correctly 2x7). And tada - we have one of the classic balancing issues when people raise difficulty over 150.
The point of all that is, (if you're interrested in backgrounds), raising difficulty makes wheapons and armor more and more useless, some caves with 3x difficulty spawns become nearly unplayable, and for killing high lvl dinos, you get more XP, what is one of the biggest problems with other mods that use max lvl 600 or higher like Annunaki, because first it's hard to kill even a lvl600 dodo to get some hide, and only a few hours later people start power leveling by killing lvl600 paras, ptheras and others.
And if you do a perfect tame of a lvl 600 creature, your unleveled dino is 900 after taming, so the high amount of bonus lvls on high difficulty values destroys the balancing against wild creatures
So psycho designed his mod for vanilla difficulty, trying to make the whole playthrough challenging but senseful.
People can feel free to raise their servers difficulty to whatever they want, and maybe try to copensate balancing issues in other ways, but best way stays playing on vanilla difficulty.

Hope that answered your question XD

Thank you very much, if I understood correctly, the mod will work correctly on the vanilla level of complexity, and if I raised the complexity, then problems with balance should be solved by my own methods. Everything is clear, thanks again