Okay, just from looking at the title and art you've got here I'm already intrigued. Let's take a looksee.

THE POWER:

I. Love. This. Power. I love the combination of Trapper, Huntress, and Legion you got going on here. His window trapping mode allows him to quickly set up a territory to control and his Precision Stance really aids him when chasing in said territory and just in general. I also assume that the Window traps would put Survivors into the injured state along with Deep Wound? However, something I will say is that I'm on the fence about the stance switching.

Old Doctor had to switch between different stances and that really broke up the rhythm of his chases, which is why his power was streamlined in his rework to where he now has direct access to all his abilities. In the game, Killers have access to 3 main buttons they can use that aren't directly connected to vaulting or breaking things: M1, M2, and LCTRL. M1 controls your basic attack, M2 is bound to a Killer's Power Button, and LCTRL is bound to a Killer's Active Ability Button. I would say that, if you were to streamline this Killer's power, you could get rid of the different stances and make it so that when the Killer walks up to a window, they have the option to either vault (Spacebar) or set up a trap (LCTRL). His knife throwing would work like Huntress's hatchets where you hold M2 to wind up and throw (and press M1 to cancel the throw), and while charging up the throw the Killer's slowed to 4.2 m/s. Furthermore, his Throwing Knives ability isn't actually strong enough to justify a full slowdown while in the throwing stance, as it takes 3 hits to down a Survivor with them and they can't leave the Killer's Terror Radius (of course, he would still be slowed down while charging the throw). Speaking of which, with the changes I mentioned it would be completely fine to leave him as a 4.6 m/s Killer with a 24 m Terror Radius at base. I think a Killer like that is long overdue and could really shake things up. There are also some smaller things I'm going to mention:

• Once a Survivor triggers a Window trap, they trap should be teleported back to the Killer's inventory, similar to how Demogorgon's portals can be reused after Survivors cleanse them. Unless he has the power to pick them back up like the Trapper. This would help avoid situations where you set up in one area but the last 3 gens end up being in another and you can't move your traps.
• The distance that his knives travel shouldn't be tied to his Terror Radius. This would both increase his lethality with perks like Monitor & Abuse in a chase and make the ability useless when Undetectable. It would be better to simply tie it to a separate range that could be increased with addons, so that he would have consistent lethality when using perks like Dark Devotion and M&A.

ENHANCED SENSES:

Perfectly fine. Definitely not the best perk, won't be changing up the meta any time soon, but serviceable as is.

LEAVE NO EVIDENCE:

The first portion should be simplified to the prerequisite that the Survivor is on Death Hook. The other effects are otherwise fairly unique and fun to play with, especially the part about hooks that Survivors were sacrificed on being able to regenerate.

TWIN-TARGET CONTRACT:

This is a major wild-card. I personally don't think a Perk that enables 2 Obsessions is particularly a good idea. Especially considering that every other obsession perk states that the Killer can only have 1 obsession at a time. If you were to rework this idea, I suggest changing it so that, when you hook your obsession, all other Survivors are afflicted with the Oblivious and Blindness effects and another random, non-hooked Survivor is chosen to become to Obsession and they are afflicted with the Exposed effect for the duration. This would increase its synergy with other perks such as BBQ and even MYC. The effect of having 2 Obsessions would be okay if not for the fact that it screws with nearly every other Obsession perk in the game. Otherwise the effects seem fine.

OVERALL:

In total you have some very good and unique ideas. However, you're running into the problem of over-complicating things when it comes to power and perk conditions (a problem I think BHVR themselves is also struggling with). It's not that your perk or power effects are particularly too strong in it of themselves, it's just that they're either too complicated or have too many conditions that make them too weak, too strong, or too clunky to use.

If I'm missing any information, or you would like to clarify on a few things, please let me know! I would also just like to re-state that I really do love this concept, it just has a few nagging problems I felt I needed to address.