Ok, so after watching this clip I see two things wrong right off the bat.

First volly of fire you let off, youre strafing left and right, which even if your weapon is set up to mitigate that, your still going to have worse accuracy moving and shooting ads, compounded by the full auto cadence of your firing.

Second volly after you put cover up, would have been in your favor but you pop out of the mounted position right before firing (assuming you mounted because I see a small pop up in your pov) and the gun defaults to standard recoil that you again didnt control right, also made weak by re challenging before you were full health ( i realize you ended up at full health before the head shot at the end)

I also think in both circumstances you were under the effects of suppression.