When taming don't place the kibble immediately. Multiply 80×(The amount of kibble request) and then subtract it by the creature's total food points. After you get your answer, wait until the food points on the creature drop to the number that you got and start feeding it the kibble.
Ez tame even for early game , just use 4 billboards, put around rhino when still unaggro and then when the rhino is trapped with the billaboards just start shooting tranqs . ( Can use wooden billaboards)