You need F(smolder) to lower cooldown of 4(comet strike) which lowers cooldown of V(tremor). Despite the buffs they give, you have to keep your rotation of skills so you can have as much tremors as possible, since its the main source of damage when it activates incineration effect, and you need that effect to spam more burning fists.
Now the thing is that simple mode is good yeah, but it doesn't care if you already used comet strike or not, it simply uses F(smolder) when available, so u might end up using smolder before comet strike and then you wont have smolder to lower cooldown of comet strike. Manualy, different story... train it, get it perfect, and you get the best output dps possible (but only if you have good ping+fps, if not, go simple mode.)