Wilbur Precipitation-Based Erosion adding weird bumps

[Naima]

The steps should be a result of the original data being an 8-bit PNG. Median won't change those flats or edges very much, but it will kill very fine detail like single-pixel noise items. The larger the window on the median filter, the larger the size of individual details that it's likely to kill. I added it to kill those single-pixel towers that tend to crop up in my preferred blur/basin fill/incise/precipiton loop. Using Morphological Erode also kills the towers, but it widens river valleys and sharpens mountain peaks as well; Dilate will broaden the towers into little square blocks, and Median will just sort of smooth it over without killing detail in the same way that blur would.

I understand that I have been relying too much on the same combo of filtering when using wilbur, I do

add noise ( 3 -5 %)
fill basin
Add noise ( 3- 5 %)
fill basins
incision flow ( wide )
add noise ( 3 -5 %)
fill basin
Add noise ( 3- 5 %)
fill basin
Add noise ( 3- 5 %)
fill basins
incision flow ( medium )
add noise ( 3 -5 %)
fill basin
add noise ( 3 -5 %)
fill basin
Add noise ( 3- 5 %)
fill basins
incision flow ( thin)
add noise ( 3 -5 %)
fill basin
Add noise ( 3- 5 %)
And I get the spikey points usually I remove with 3x3 blurr pass...
I guess there are more filters I should take advantage of, but I didn't understand what is for what in the other list, do you have a description of the other filters , and their usage or utility somewhere?