The detonator guy/bomb hostage at the very beginning were 95% of the resets because kicking him while downed wastes time.

Double smoke on the street section allowed the big guy to be caught off guard and 2 shot (instead of the 6 average it takes to kill him). The other two smokes were used as protection against enemies that do a lot of health damage through basic armor.

Destroying the small bomb at the big bomb destroys the camera. This avoids extra enemy spawns while trying to defuse.