Yeah, that tactical is super good. Refresh dots easy peasy on targets, can pull silly numbers and save heat. I use it to refresh dots after your last mag shot where your missile and serrated dots come, then once again after unload as filler to refresh because it's risky just using it where you'd reapply dots as you could easily lose them and have to reapply them normally.
I also let it tick twice sometimes to keep the damage and gcd time the same as a powershot and an incendiary missile and serrated shot combo
I think for outright damage for a burst and aoe burst rotation energised charges probably parses a bit higher and magnetised shrapnel is nice as you can use dart and detonator in your rotation but yeah, continuous fire is very good