Trade HP wisely. It's smart to have some HP left for the endgame, IF you can. There are often, literally, thousands of dmg points available for free in the endgame cleanup phase, if you can reach it.
Max your vision, and then some more. Food and optics. Vision can sometimes give "free" spotting damage without you doing anything special. Those little 700-900 assisted damage points make the difference.
Honestly tho. You need to get lucky or seriously up your game. You are doing 2600 damage with it, you need to add another 1000 if you want to get it "without luck". Plu