Blender/ texture qaulity!

Hi all im having a problem when uploading my final texture to SL from blender. The qaulity within blender is fine but as soon as i upload it into SL my textures seems to lose alot of qaulity. edges seem warped etc. I've attached a picture of what i mean. I normally bake my sculpt as a 512 x 512 the particular texture im applying is 512 x 1024. Ay help greatly appreciated as always

Have you actually tried it on your sculpt yet? The reason I ask is, the only time I've ever had anything like that happen, is when my actual sculpty wasn't smooth and it gave a warped look on the surface texture.

Where the vertices are not all square together you will lose more/a lot of quality. Some faces are stretched, while others are squashed
Make a copy of the item, just for texturing.
You could try:
Edit item, press "A" (select all) and press "W" (subdivide) and ramp up the number of vertices by doubling.
Create a new image to bake to but make it 2048x2048 or bigger. Be prepared to wait longer for the bake. Then shrink back down and tweak for export/import to SL
Making the bake bigger allows for more pixels to be included between edge rows and verts.

Just a suggestion...it can help in some cases

It's usually a good idea to import the sculptie map into blender and use that as the basis for baking textures rather than your original model. The sculptie map is quantized to 256 steps, so reimporting makes sure the texturing model has the same quantization. You can use the bake selected to active features in Blender to bake from the original model to the quantized one if needed.