Yeah, unflinching is for aggressively-in-your-face-sniping. That's closer to my way of play and performance bonus isn't consistent enough to warrant using for me, unless i've spent hundreds of weapon parts and can't get a perfect roll. Hidden hand isn't something you want to ignore though, not only does it make some difficult shots piss-easy, it also makes simple things like drag scoping much easier. Not to mention that every other perk in that slot is kinda useless, such as rodeo or mulligan.... Quickdraw will give you the same ADS speed bonus as snapshot, along with faster draw and ready time. Injection mold gives the benefits of quickdraw (to a slightly lesser extent) AND adds stability, with a slight sacrifice to range, which, is mostly not important on sniper rifles. Snapshot works too but I wouldn't scoff at quickdraw or IM. Do whatever works best for you though, this is just what I've found to be the most effective for the current sniper perks.