These potions aren't going to be a huge difference but you could use them in your daily hunts to increase your damage. Something to note is that they don't stack with spells that increase your distance. So it is pointless to use them if you are sharpshooting as you will lose the skills from the Bullseye potion.
One situation where they could be useful is when your skills are debuffed. If your distance is lowered and you use the potion your skills will go back to normal plus the potion modifier. Or depending where you are, you could just use sharpshooter to get around this as well.