No algorithm is perfect or satisfactory.
Have you tried changing the settings in “Options”, or turning off “Smooth” or “Stack scans”? I find that tweaking these switches and values yield very different results. A small change or a different combination can go a long way, and it isn’t as simple as increasing an effect – the visual change isn’t linear or predictable in my experience. It will take a lot of time to get it just right, as Goldilocks would have it.
Even then, you may have to do some heavy editing in Inkscape to get things to fit your standards.