Wouldn’t call texel density key. Normally a good material will overlay a few textures to break texturing - that said, it can be helpful.
The uv map looks alright.
The next issue could be the export type/smoothing.
Because the red seam you May have a sharp edge marked under that seam. Check that by removing all seams.
Make sure you export either seams or faces
When you import make sure to select import nortmals/mikkt
See if that makes a difference or not.
Last thing you can try is to move the Uv map off the edge. It should really not matter, but maybe it’s too close to the edge for the size you are baking.