Another option for applying viral for more damage and rad for ancient healers and procing [Synth Deconstruct]. It has the advantage of getting more status procs from multishot, and hitting multiple targets with the blast, but even so I think [Cryotra] is generally better just because the beam doesn't have any travel time, while on the melee [Gauss] I frequently kill enemies before the rockets even hit them.
[Hush] to make enemies target your sentinel less, Terminal velocity to make sure the rockets get there as quick as you do when you're a Gauss with Dispatch Overdrive.
Counter-intuitively, the punch through from [Primed Shred] is a good thing in this case despite this being a rocket weapon, since you have no control over where the sentinel aims, and it will frequently launch the rockets into walls and other thin obtacles if there's an enemy on the other side, wasting the volley. Even when firing directly at an enemy, the rockets themselves deal plenty of status without exploding, and if firing into a crowd it can hit at enemy or two behind your target before exploding.
Frame: Melee God Gauss
Melee: Melee Gauss's Spinblade Cyath
Primary: Sentient Stripper Shedu
Sentinel: Helios Prime
Sentinel weapon: 368.7% status Cryotra
Sentinel weapon alternative2: Rad and Viral Deconstructor