After reading through the topic I've made a rotation using what's been discovered plus what I use after your reload ends.

Taking the Initial Rotation from
QR -> Split* -> 2xBuff -> Hot Shot -> 2xBuffs Lead Shot -> Reload ->Wildfire -> Slug* -> Split* -> Reassemble -> Clear -> Slug* -> Split* -> Rapid Fire -> Gauss Barrel ON -> Clear -> Guass Round -> Slug -> WildFire PROC -> Split -> Guass Barrel OFF Hot Shot -> Lead Shot -> QR -> Split* -> Filler

This only gives you a 30 second downtime before you have reload up again. I use Wildfire during my reload combo and I use rapid fire afterwards for the quick damage boost on my clear/slug procs via Guass shot. The second QR could potentially come during the Guass Split shot if you're holding on to your charge.