As much as I know about solo raids (not the others) Let your first 2 characters die, turn off god mod and let them die, than use your third character slowly, don't finish off the enemy instantly or it'll detect it as unusual gameplay. Use low level characters if you want to avoid one hit kills in raids (though the hp is too high for ohk, but still). I am doing this and rarely get unusually gameplay. Avoid champions arena and normal arena because if you get too high in there and you are not high threat level others could report you as cheating; same goes with league raids, doing too much damage without a good team will make other people suspicious