On primative taming this is a lot harder but can be done! Use the ark calculator and add 10% the amount of boulders needed. Don't fire when he's throwing rocks as it won't register and don't space out your shots it's not needed! Use stone pillars to trap it and if it's a high level get someone to replace the pillars as you're fighting. Two catipults are preferred.
It's a bit silly that kibble tames it a lot better than rocks or sulfur because even in the dossier it says that it lives off of absorbing nearby rocks and minerals. So mabey they should make it so you have to feed them a rare mineral like obsidian what if they made it so you could tame one fast and with high effectiveness by giving one a few hundred or few thousand obsidian . or what if there kibble was made out of a combination of ores and minerals .