Slash proc damage scales with damage multipliers. As such, headshots, orange and red critical hits will greatly increase the damage dealt.
Slash is affected by status duration mods. Using Hunter Track in tandem with Hunter Munitions will increase the base 6-second duration to 7 seconds, allowing for 8 ticks of damage rather than the normal 7 ticks.
The 30% trigger chance is independent to itself and is not affected by the weapon's status chance, or damage type distribution, besides being indirectly affected by its critical hit chance.
It is possible to apply up to three unique status effects per pellet with Hunter Munitions. This can occur if the weapon has an innately forced status effect proc such as Impact, and Hunter Munitions procs Slash, in addition to a status effect proc from the weapon's status chance.
Combining this mod with Concentrated Arrow will allow the arrow's explosion to proc deadly Slash procs for potentially more than 3,500 True damage per tick.