To use [Growing Power] you would need one more forma.

For more duration, drop [Fleeting Expertise] for [Streamline]. With this, you can no longer sustain Cloud Walker indefinitely. However, you will have highly comfortable duration.

Roar to also buff clone. If you don't care about the clone, can use [Xata]'s Whisper, Eclipse etc.

Perspicacity subsume for spy.

If you want to use [Iron Staff] and don't care about clone, subsume some damage buff or melee buff (Wrathful Advance) over clone. Then also consider [Primal Rage] augment and [Primed Flow].