Use 3 regular crimson shards for strength or 1 tauforged and 1 regular crimson shard to [Reach] 100% strip on Avalanche with one cast should you have max stacks of Molt Augmented. Fill the rest with amber shards for casting speed..

Breach Surge is a necessity for circuit runs, but if you're going into endless SP another alternative is Nourish for help with your energy economy along with a viral multiplier greatly boosting your DPS against the enemies you armor strip. Or you can possibly use Ensare instead for grouping purposes as the high range you have will greatly benefit your hard CC capabilities.

Fire rate arcane for the weapon of choice that you run or Arcane Energize if you are struggling with your energy economy.

This build uses Arcane Velocity with this Laetum setup