if youre going for that build, either predator or dark harvest.
your goal just seems to be to get on top of someone and almost 1 shot him with your q, right? both keystones should help with that.
id suggest fully committing to the build and replacing the cleaver with triforce, and the warmogs with steraks. dont be discouraged by the little bit of mana on triforce. the sheen procs are worth it, and even the attack speed can be useful.
at lvl 18 with a steraks gage, that sheen proc will add just above 400 damage to your q and your auto attack weaves.
when youre not up against tanks, but only fighters and squishies, there are good reasons to take triforce over cleaver. burst potential on squishies, higher movement speed, powerful damage against turrets, improved sustained damage between spins.
you should only ever run this when youre up against relatively squishy teams though.