You can also try [Galvanized Aptitude] instead of [Hammer Shot].
For a Viral/Heat/HM approach:
For a build in sinergy with [Zephyr Prime]:
- remove [Galvanized Scope] and [Primed Shred], put [Bladed Rounds] and [Galvanized Aptitude], then Primary Merciless as arcane.
- for the frame, you'll need Arcane Acceleration as one of the arcanes, the critical chance here will come from the frame passive ability (and Bladed Rounds mod while aiming); the strategy is to use the Tornado ability and shoot the alt fire on the engulfed enemies.
- also try the Synth mods (set) on a companion for always have a reloaded weapon's magazine while holstering.