If you have a sharpened vMA bow on your backbar, use an Infused weapon on your main hand, and either precise or Sharpened on your offhand (based on group penetration), reason being that Endless Hail will benefit from both the Sharpened and Infused trait while on your front bar, especially potent in terms of cleave / AoE.
More generally speaking, vMA daggers / axes on a stam DK this patch have a lot of issues, first one being sustain, second being DoT uptime, so you'd probably get better results with a heavy attack build or mixed LA / HA setup without maelstrom daggers / axes.