its probably not a thing of changing any server settings, its more a thing of how to knock out correctly. There are 2 things you may know as you are not new to ark, but i will still mention them.
1: crossbow tranq arrows tick 5 sec after you hit the target - so you shoot count to 5 and shoot again to gain the most torpor for you arrow count - darts are 7 sec if i am correct
this way you put less harm to the dino but still get the max torpor out of your arrows/darts
2: yes some dinos get killed (i.e. dire bear) if you use a crossbow and pump it full of arrows as quickly as possible, but some bears have lower HP stat than others so shooting slow can help
some mods as awesome spyglass (sadly for you its a mod) make it easier for you, bec. you see the HP and torpor all the time, but you can check the dinos HP and torpor with a magnifying glass (this is vanilla) if the dino is trapped and is in torpor-run (I guess above 75% torpor they start running) also you can sacrifice yourself or drag a dino corpse to the dino if its a carnivore, it meight harvest the body and will heal 100%. Snow owl you can use also for healing mid tame/tranq.
So to answer you question, above: No I would not recommend messing around with those mutiplyers you asked for. I did it never and had never any issues.
If you want to be 100% save use a better longneck with shocking tranq darts - they are the most potent tranqs in the vanilla game. I think dododex have also a form where you can fill in your weapons damage and get a result how many darts/arrows you need or if there is a chance of kiling the tame.
Hope it helped.