We make our own gels for the western blots, both 7.5% and 10%. The top half of the gels appear to look fine when we are imaging them, but the bands on the bottom half are extremely fuzzy, light and, kind of begin to blur together.
Personally, I always make 10% gels. I have also made 7.5% gels, but not as often. Whenever I encounter issues with bands showing up unclear on my 10% gels, it tends to be an issue with the transfer process. I would suggest ensuring that while completing your transfer, there is no shifting of the gels and nitrocellulose papers. If there is even the slightest shift in the nitrocellulose paper and the gels during the transfer process, this causes my bands to appear unclear or "fuzzy" and causes me to be unable to obtain quality data from them. This may not be the issue in your case, but I hope this helps. I have attached a publication which I reference whenever I am attempting to troubleshoot issues with doing western blots.
Article Western Blot: Technique, Theory and Trouble Shooting
Depending on the size of your proteins, a 10% gel may not be appropriate. Try a 12.5% poly-acrilamide to improve the resolution in the small sizes (you will lose resolution in the big sizes mind you...)
If you need to see both regions in high resolution, buy a gradient gel (or try to make it, but easier to buy it) that is 12.5 (or higher) towards the bottom and 7% (or lower) towards the top of the gel.
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