I'm just gonna respond to the last bit about the melee combo for now; no ill will intended, I'm just a bit under the weather.

38.1 seconds is your burst of three combos at once. You're not realistically gonna go in for 5.2, duck out for 7.5, come back in for 5.2, duck back out for 7.5, then come back in for 5.2 though even if you did that's 15.6 seconds of melee uptime (and a LOT of extra movement because reasons).