Always be moving/dodging, do glory kills for health, chainsaw for ammo, and most importantly master the Quick Switch technique. This person has a great guide on it. It's basically where you switch weapons after every shot so you don't have to reload and you output damage really fast even on the hardest difficulty.
Given that you are on a controller you can just swap between 3 weapons and still delete enemies. Like here is my play through with my steam controller where I pretty much spammed super shotgun, ballista, and rocket launcher to get through the game on nightmare. There was an update pushed that lets controller uses bind weapons to any button, so set weapons to quick switch with that over relying on the weapon wheel which breaks momentum.