Vigilante set all on because these apply to you as well, even if your sentinel dies, giving you 20% chance to boost a yellow crit to orange, or an orange to red.
Critical and fire rate mods because this sentinel can proc arcanes for you while you're spawning wisps, and acceleration and momentum both proc from critical hits.
Any sentinel weapon that can use the vigilante mods works perfectly fine for this, do keep in mind that building them to kill vomvalysts is pointless, due to their auto aim constantly shooting below the vomvalysts due to sentinels not being allowed to go for "headshots". They'll never hit them, or if they do it will be completely unreliably.