Drogoz is very hard to hit while in air. Don't stick your bombs on him, just detonate bombs in-air close to him. Your bombs fly faster than his rockets and poppy bomb (legendary "Accelerant" recommended) lets you dodge better than his thrust.

You can kill Drogoz while he is using Dragon Punch if you stick at least 3 bombs on the ground and explode when Drogoz get closer to them.