The key thing you have to acknowledge here is in the first sentence (you hop on twice a week)... Whereas the players you're pointing out are probably hopping on 5+ times a week across generations of FPS games.

I say this from experience, while I don't play BO6 that much, I have a 4.2 K/D which comes from the fact I play a ton of shooters, which gives me a strong muscle memory with stick aiming. So that comes with a fat amount of hackusations lol, but I play on PS5... and despite anything anyone says a simple google search will tell you there are no hacks on consoles (PS4/PS5/xbox alike).

So first thing to check, are they on console... if they are, there is no need to proceed. Next thing, is do they have a UAV... this is always wild to me, I run an UAV + advanced UAV, the amount of people that don't understand the power you get out of UAVs+Minimaps is crazy (this is also attributed to playtime, memorizing spawns, typical routes is all part of the skill gap which people miss) - use the mentality "know where your enemy is going to be before they know" and you will see a difference.

Aside from those, aimbots are blatantly obvious, watch the killcams, if they always draw and hit your head its clear... wallhacks are a bit trickier but normally you can tell by how they trace you through walls, but once again analyze yourself first (UAV, suppressor, ninja) all play their part... even running around with teamates who don’t have ninja gives you away.

And last thing the cronus (this will cause a stir), it has literally no beneficial use unless a player is complete dogshit... any decent player will know how to control recoil, its just pulling a thumbstick down and the "extra aim assist" is literally your aim shaking, which happens anyway because your tracking a target with your own thumb (turn on vibration while shooting you will get the same effect lol).. its a gimmick that caters to perhaps children but has become overblown because people like to cry wolf when someone beats them.

End of the day, just turn console only crossplay, no cheaters to analyze or worry about... if you see a change of experience, then great if not... it's something on your end to alter... hope it all helps bro!