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You should have access to Rank V+ (Effectively VI) gear at this point. Chapter 1 caps you at Rank III. Chapter 2 caps you at Rank V. Remember that you unlock the next tier by having everyone wearing 3 trinkets of the previous rank+.

You can also load up everyone with 5 Battle Energy once you're using Rank V+ gear to get an effective Rank VII, which should really drop the damage you're taking if you're still having difficulty.

I asked them on Twitter, and they said it was up to the publisher. So as of now, no current plans to do so. Just GOG and Steam.