Honestly people make to much noise about stability. I run it with the bottom perk (forgot what its called) but it increases my range to a point almost of hawk moon, while also decreasing my stability. Also I don't really know, on the shots to kill. I always go for the headshot because of the Maverick perk so that I have to reload less often also having firefly helps with the incentive to get headshot as well. But in all seriousness, learn how to control guns without stability upgrades and you will be amazed on the other play styles and perks you can use, because your not waisting perks on something you mastered. It's easiest on auto rifles, mastering stability without stability perks. But mastering any or better yet all the weapon types without stability or major crutch perks and instead fixing your weakness, makes it so you can use different perks, allows for a more diverse play style, and you will see your overall gunskill increase as well.