Controller aiming

A few months ago, I posted a thread about how you guys can aim properly on controller. I actually stopped playing 2 weeks after that coz I always get killed by Lv. 500 players (eventhough I am just Lv. 81. F*cking matchmaking) and went on playing on Steam version. Anyway, so I decided to play it again yesterday and I decided to rock SMG and Sniper/DMR as my loadout. I created a new US account so I am back at Lv. 10 now. Surprisingly I can actually kill now. SMG is stable. CROUCHING while shooting is also important. There are a few actual people I have killed now (I know they are coz they are freaking camping and snaking at Sanhok.) So yeah, SMG is a good gun to use. Last night I was able to control the DP gun. However, M416 and AK is still a no-no gun for me. Aim is always off when I use that gun.

Btw, I said I am level 10. Last night I got wrecked by a Lv. 500 player. How is that possible? What an ugly matchmaking.

Main: Vector w/ attachments (mostly half-grip and supressor/compensator)

Secondary: Kar98k/ M24/ SLR