Hi Plasma, also attached here is the 3DM model file for the above.
If you want to make it rounded in the vertical direction as well you might want to do that by placing in more sections and doing them with Loft as well.
Like for example a few extra sections:
Then Loft all of those with Loft style = "Loose" :
Hi there, a bit late to the party but what it's worth, I've found through the years, not only with Moi, that filleting is a complex animal like Michael mentions, sometimes it'll work when you fillet edges in a certain order and sometimes it sorts it self out when picking all the edges, like in the video, it's a case of trying different picking orders and methods.