Impact Progenitor + [Pummel] (can be replaced by Saxum Splittle) + [Hemorrhage] = Slash Procs Galore!
Lethal Torrent (can be replaced with Anemic Agility or Gunslinger) will not mess up Hemorrhage 70% Slash chance on alt-fire only
Galv Diffusion, [Hornet Strike], [Creeping Bullseye] (Can be replaced with [Primed Pistol Gambit] [This will still not mess up [Hemorrhage] 70% even with Anemic Agility), and Primed Target Cracker for AoE damage on alt fire.
Synth Charge (Flex slot) does wonders on the alt-fire. Be wary of a nerf for this interaction!
I would still try to go for a headshot with the alt-fire for better single-shot damage as well but can be shot at the ground with great effect for CC and damage.
Exilus is your preference!