Texture resolution in Web Build drastically drops

I’m using pixel coordinates to map parts of the texture - in this case an arm rig with clickable joints - in a GUI, and when I export to Web, the resolution turns to garbage. I noticed that if I assign the “Non Power of 2” parameter to “toLarger” (currently at “toNearest”), the problem is solved, however then it screws up my mapping.

In the PC build the problem does not occur. How can I increase the resolution of my GUI texture in the Web build without adjusting the “Non Power of 2” parameter?

Problem was completely elsewhere - I simply had to override the web settings with a higher setting (“fantastic”).