You're not that much higher than me in combats. But when I stay for 130 or so kills (I lose track, but based on crimsons recieved) I usually use up quite a few potions, and buying them back at GE price, fixing Barrows at my house, selling all loot at med price as well, I still make a steady loss. Either way, I prefer Slayer, as I have no need for 99 summoning just yet, and Slayer is more constructive combat.