300k+ an hour- Fel Lizard men. Use slayer + whirlwind. Have a macro to cut leather. no need to loot for gold. You GPH depends on how many BOS charges you bring. But then you have to sell the spined to get the cash.

200k++ an hour at Fel Ice Fiends. I have tweaked myself to get one swing (using double axe, double swing ) kills about 60% of the time.

180k an hour at swoops. I get 3 hit kills on em. But much better loot than ice fiends.

150k an hour. Fire Demons (Fel), using demon slayer ornate and momentum strike.