You have the overall resolution 1072x1072, so set the LandscapeScale param to 107200 and if You didn’t move the landscape, it’s pivot should be at X = -53500,011719, Y = -53500,011719. Set the offset params to this values, and it will work for sure
That’s why I like to use Z projection instead of landscape coords - it gives me full control over texture size via material instance, so I need to create just one master material for all landscapes in the game even if its sizes are different. LandscapeCoord node has te size “hardcoded” inside the material, so for me it’s useless.
The simplified version of Z projection (without offset) is great for setting texture tile size for landscape layers. The value You set for Scale param represents in cm (= UE4 units) how long is the side of one texture tile (e.g. Scale = 400 means one texture tile covers 4x4m).