So after trying to tame one for a little bit I can confirm that the dino size matters my shadowmane has 50k health and only gave about 6% health also matter but not as much as size.

Some dinos cannont be used all together as my kentros all with 65k hp + were not even being mind controlled.

I am currently now breeding Brontos to tame them, and would highly recommend using them for max effectiveness make sure your dinos are healed to full health and that the noglin is either trapped or far away from creatures and fly traps as the traps will eat the noglin of your controlled dinos head.

Rex: 4% with 9k/12.5 health

Shadowmane 9% with 51k/51k hp

Brontos i hear give 20% per bronto with assuming leveled health

Void Wyrm: 20% sane as bronto

I learned all of this on a semi boosted server with 5x taming and a wild dino level of 300 max.