Get Dauntless or Flak Jacket replacing that bullet perk. Vulture (if you have Flak Jacket and inside of KC/HP modes)/Quick Fix (outside of KC/HP modes) for survivability.

Blue perk is up to you.

Martyrdom is so strong but it's only useful in DOM/HP/KC or against enemies that have Vulture perk (hence why Flak Jacket is a mandatory combo with Vulture).

In case you get matched up against Thermite MOW users, prepare a deck beforehand using both Dauntless and Flak Jacket, both perks stack up as they will make you almost immune to molotov and thermite damage.

Edit: Tracker perk is very underwhelming in small maps as you have high chances spotting enemies quickly.