I'm new to path, only played last season.
I've started a cyclone impale this season currently level 90.
Without impale support I have 90% chance to impale.
I wreck T16 maps I just struggle with boss damage and survivability.

What's your suggestions for skill gems?

POB?

Pm me a pob and ill take a look, impale support is generally best in slot for impale effect alone.