so what exactly does Arbiter gain at +1 etc?

I just tried +1 for the first time.

I was prepared for the +0 before with zero xp to lose and knowing his abilities from youtube.

But on +1 it felt massively out of sync. I'd really need better combat logs to understand what killed me (used to warcraftlogs). Once it was the fire that fills everything but a narrow corridor - while I was standing in one of those circles that I need to stand in. Not sure if there was a safe pixel, but I play a budget Gemling.. I move like a snail or flicker around randomly.

The other 3.. just boom dead wtf happened?

So please, can you tell me, what are the actual changes from basic mode?

Is it less time between abilities?
Is it overlap of abilities?