A Spino loses torpor VERY quickly after being knocked out. Remember that torpor doesn't drop when it's rising after a narcotic is fed, so gradually feed it narcotics - dont spam 30 and then walk away. You'll go farther on less drugs.
Hey, ok so the center, coordinates 08.1 / 63.4 spinos will spawn there, if is not high enough just kill it, leave the area and come back after 3 mins. Normally works, I found a 150 and I'm taming it rn
stand on a high cliff and shoot it or keep shootong it and running away on a raptor until it's knocked out. it gets distracted very easly by fish, sharks and manta's (even while chasing you) so you may want to shoot it while it's distracted.