To get the extraordinary kibble you will want these. Tame two rubbish ones and then breed them until you have five or six females and one male. Make sure they are all off mating at this point. Then you let them poop out a bunch of eggs. Voila, you can now have the best kibble.
In terms of taming method build a 4x4 foundation section with two wall high doorways around it. Then build a ramp up one side. Lead the Yuti in NOT USING A MOUNT. Then go around and kill all the carnos around it. Dart it and then you have a Yuti.
This thing is an absolute beast. I tamed a level 120 and pumped nothing but stamina so it could yell at my dinos to do better when fighting the broodmother. They were so inspired, that they got a 25% damage bonus, and a 25% damage resistance bonus meaning we completely shredded the broodmother when it may have been a close fight. One or two of these behind your army and you, my friend, have comrade stalin himself telling your troops to fight to their last breath
The fear roar is amazing for taming because the damage increase reduces the amount of tranqs you would need to use to knockout something. make sure to have already caged the creature though because if you don't they will run away.