I just checked based on the suggestions in the comments. I can confirm that changing arrow types after nocking multiple arrows will cause the old type of nocked arrows to be unloaded and the new type to have a single arrow loaded. Switching back to the first type of arrow will cause Aloy to only have a single arrow loaded.
However, interestingly enough, unequipping the bow entirely then re-equipping it will result in the same number of arrows being nocked before and after the fact...
My favorite strategy that blends stealth with action is to create a mess of tripwires between you and your prey while utilizing Concentration and Tearblast arrows to stealthily take out opponents from afar.
From what I can tell, setting tripwires (though very loud) is perceived as silent by Machines. By that I mean you can place them literally on top of/through Machines and they won't have any idea who did it. Even when walking into tripwires, Machines typically will not find you if you're hiding behind rocks or in tall grass.
Once you've effectively set up a no-man's-land of crisscrossing tripwires in every direction (bear in mind that the maximum placeable at any time is 16), you can try getting headshots/destroying components of Machines. Another way to set these up is to basically fence a group of Machines by using tripwires. Electric will immobilize them and allow you to get a Critical Hit on however many were affected, while Blast wires will cause massive damage (and likely remove components).
If you are able to use them (they are on the Sharpshot bows), Tearblast arrows will do little to no damage, but will quickly remove the components of Machines (which effectively incapacitates them) and allow you to take them down more easily. Concentration will also help you hit these components and weak spots by slowing down time and zooming in, so it's very helpful for this.
If the Machine you're hunting notices you, they will most likely charge. At this point, they're extremely likely to run into at least one wire of your giant tripwire trap and then begin the process of stumbling into every other tripwire you've set. If this hasn't killed your prey yet, it should have come very close to doing so, at which point, you can use your weapon of choice to finish them off.
Best Answer
To corrupt a machine by the use of corruption arrows, you will need to fill up the corruption meter. It will appear once you managed to hit an arrow on your target. The symbol will be a gree circular UI element with a spiral in it.
You will need to hit corruption arrows until the green part is filled up all the way. Then a white ring will appear around it to indicate that the corruption debuff is applied on the enemy.
You will not be able to corrupt machines that are already corrupted in a different way (e.g. in a Corruption Zone). Also, Daemonic Machines are immune to it (those are the ones with purple markings on them). Furthermore notice that different machines may have different resistances to this debuff.
I am not sure, but distance may also affect how much an arrow will fill up the meter.