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Ranger is definitely not underpowered.

Good Ranger PAs are Satellite Cannon, Impact Slider, Diffuse Shell, Homing Emission (sometimes).

You should also not be using solely rifle for every...

It should, like in this video (skip to 1:10)

https://www.youtube.com/watch?v=isuSH_Ye5fg&list=UU-TxcJh4VqHYrgvSH0KWDCw

Think of it like an offensive Megiverse: instead of healing, you're doing separate wind-element attacks on top of your attacks.

I believe you get it from the recycle shop, not the AC shop.

You would have to switch your sub to your main, because even when capped, you "technically" still get exp for Excubes