The main problems with Tor are, alas, its low resolution, general blurriness, and shallow zoom.
How would remove bluriness when zooming the existing texture background, this is a mistery to me, because you have either to remove or add extra pixels, and the only way to get a better quality is to use bicubic interpolation but this algo is too slow to edit things in real time.
Also remember that we are working in 32-bit composited mode and conventional memory.
The only solution would be to work with a back buffer, and bypass the GDImage zoom control, to manipulate just the part matching the view port.
The current bluriness is the exact same thing you got in Photoshop when working with the transparent UVmap and multiple layers.
For me, i keep saying that the main issue is to save the changes into the OBJ file.