Moist_Sock

Open your case up and shove a decibel meter and see what measures the loudest.

M30x need replacement pads if you don't want ear cancer. No idea how comfortable the other headphones are, though the Sennheiser 4XX series is typically pretty average.

It should be in settings, though It'll disable when typing on screen as well if you still want that.

uwot COP's are incredibly efficient. My DAP powered them to listening level at like 20%

USB mics are rarely designed for professional use, and the ADC's in them are often just straight up not as good as a proper interface. Along with that, you also get gain control and multiple other functions on the fly with a proper interface. USB mics are great for ~$50-$120, but after that you're getting very little extra for your money until you jump to a proper interface and studio microphone. Second hand interfaces are dirt cheap, and good XLR microphones are very easy to find now. Hell, I've seen a guy with a Behringer UCA222, a DIY phantom power supply, and some chinese microphone that sounded better than any of the higher priced USB microphones. His whole setup would have only been about $80 USD.

K612 are a much better option. Unless you have a stupid loud aircon, ANC while indoors is pretty damn useless. K612's will have a lot better imaging and soundstage, and straight up more raw detail. Why not just keep both your AKG and the QC35? Use one for home and one for travel. Repairing a headphone is typically incredibly easy if you have patience and remotely any skill with a soldering iron.

At that price you'd want to get an audio interface and an XLR mic. I have no real suggestions for either, but I figured I'd at least give you the right direction to be looking in if you're not already.

Yeah, sure. KZ/QKZ have some great value shit. I own/owned several of their IEMs. But OP can easily get much better sounding stuff for $200. If he has the budget he may as well go to the full extent and get a better experience. I find it unlikely that OP hasn't tried cheaper IEMs that are comparable to KZ/QKZ gear and is making a leap from something like Earpods or ErgoFits or whatever. OP's likely to have assessed their needs/wants, and given themself an appropriate budget. Sure, spending ~$20 may give him 70% of what he's after, but that extra 30% or so is what OP deems appropriate to be spending $200. It's certainly why I no longer use any of my KZ/QKZ IEMs.

His budget is $200, not $20

If you want open back, go 558's. And if you need a mic, get a modmic. Sounds better than the open Senny headsets and give you the option to remove the mic when you don't need it. If you want closed get the Cloud Core [not the II's unless you want better mic quality] The first clouds are cheaper, and only difference is a somewhat better microphone, a shitty USB soundcard, and additional velour pads. Sound is identical. You can get the first clouds and some HM5 pleather or velour pads for the same price, and end up with a comfier headphone than the II's.

Left side is typically where the inline mic or playback controls are, and they are always a massive weak-spot. I go out of my way to purposely buy IEMs that don't have controls or microphone purely because of that. You can repair them easily with a soldering iron though. Last time I repaired one I bought some cheap IEM that had good braided cables. Worked really well and they lasted for a fair while.

Try using a different driver like ASIO or WASAPI

Righto. I would have just ordered one but the Australian retailer has assfucked the price up to $200 AUD. I'd use a re-shipper but their fees honestly makes it worth just buying locally since I don't have to deal with stupid warranty/repair shit if it ever occurs for only $20 more.

Fuck, they released a new Fulla? How'd I miss that? Guess I gotta get my hands on one. I'll take your word that It's better and rescind my suggestions then.

You can have multi-key bindings to prevent exactly that Your memory is generally pretty good at that after a while. You can toggle on listen to mic and hear exactly what is happening if you're worried about leaving something on or not. Buying an entirely different unit/device does not sound simple and efficient to me. I have no idea how that functions, but If it essentially gives you a small re-bindable keyboard then yes, that Is what I was talking about. It depends exactly on the software you use though.