Nice to see you trying to make use of bump maps for realism Strom.
Here's a few pointers though:
1. I think I mentioned before that for small objects where scratching is really fine you need to use very high res bump maps and very little, if any, blurring of the scratch map. If you look at this image you will see that the "scratching" actually looks more like corrosion or like it's been sprayed with acid or something and I would be willing to be that is either blurring of the scratch map or way to low resolution of the map.
2. When it comes to making a scratch map think a lot about the actual object in use. Think about where it would get scratched most etc. In the case of these nuts, think about the fact that they are used by applying a metal tool to the flat sides and turning. That process often involves slipping and scrapping as the tool is applied. So my point is that here you have a very sudden lack of scratch on those flat surfaces where scratching is actually likely to be fairly high. the most scratched part of a nut is likely to be the vertical edges of the hexagon points. that shit is going to be cut up bad from spanner slippage etc. Nothing beats grabbing a real world equivalent and inspecting it for reference. Also I think that in general the scratch map is still being applied too strong. Tone it down by at least half for a start.
That said it really is good to see how you are actively taking on the advice provided by people here and applying it. Keep this rate of development up and I'll be coming to you for help before long

Your dedication to the art is about 10 times mine
(note to self, must spend more time developing modeling and rendering skills to avoid being eclipsed by Stromberg)