I'll add a couple suggestions. If you have a tablet try the airbrush tool rather than the paintbrush tool as it is much more responsive. Also if you blur the angular gradient before using it as a bumpmap you can use the curve adjust to define the profile and sharpen the ridge. Lastly instead of greating a 50% grey layer and applying a bump map you can apply the emboss filter directly to the heightfield with a 30degree altitude and will end up with a layer where all flat surfaces are 50% grey.
Thanks for finally putting this up in an easily referenced form. Repped and rated!