Hello anyone who reads this. I've started working with a friend on a board game and I've been tasked with making the map. I'm fairly new to cartography, so I've been trying to follow some of the tutorials on the forums. For this version of my map I've been using this tutorial. Below is what I've come up with.

Near_Final_Version_Smaller.png

If you look closely at the tighter regions at the edges of the map, the blur overlaps creating a darker black and removing the sense of depth from those regions. I was wondering if there is any way to make a blur that doesn't overlap like this.