DFAO inaccuracy

First of all forgive me for gerenal foolness around the CG as I am not an experienced user around here.

I am using DFAO to get my scene shadowed, however it is ignoring little details of the scene as stated on the images. How do I get to fix that?

Looks like I am just a general setting somewhere in engine. Is it even DFAO fail?

Thanks in advance!

Forgot to point out that, cost of the possible solution in terms of performance doesnt matter, as UE in this case used as filming tool, and isnt for live performance