For amulet i have

Frigid Finesse
Unstable Elixir

Now.

i rolled Malice on there but i kept rolling what is my best option i have Alchemical Adv right now i can choose or do i keep malice or whats the best

my 2 cents,for barrage, alc advantage is used to reach the attack speed break point in your 1st bucket, your gonna have to at least masterwork 6 ranks in alc advantage to reach a total of 9 ranks.
all top performing barrange builds including those running higher pits use alchemical advantage with 6 ranks on their amulets.