You can have some impact on the DF by tampering the default settings. These are console commands and you will find a whole lot of them to tinkering with.
That is one of the many, and it have the biggest impact on the resolution which could help in some cases, but beware you can easily run out of GPU ram and the editor will crash. Save your work before changing the settings 
It’s default value is 128.0 for me, but 192 can be a bit better in some cases.
Another handy one that can have huge impact on the result is the
By default it is 2.0 for me, but you can try values around this, eg 1.5, 2.5 and such. There are more settings too exists which may or may not produce differences but you will find them as the console command names quite similar, and the Output window will help you with finding them one by one.
You can also check up on the Global Distance Field visualizer in the editor viewport to see what is happening.