Hi Alkalin, 
I saw that the Congo river mapping was really controversial and I started to delete a series of nodes . But I figured out that there was a series of mappings outside the tile which were not corret and as a result I stopped my work and leaved the tile. I did not think that my modifications had been saved, sorry about that. 
Do what you consider to be apropriate from an optimal mapping quality point of view.
Cheers.
jfl