Hello, Capncark.
Your issue with "overall levels" is a tough bull to ride for a number of reasons.
Clipping is usually a result of peaks in the signal passing 0dB at some point in the track. Do you incorporate any compression in your mix? If you do, you need to work on the settings you use. Try a faster attack, a lower threshold with a little higher ratio, etc. If you don't use compression, you'll wonder how you got along without it. Be careful, though. Good compression can lift your perceived loudness nicely - bad compression can turn your mix into a boring moan.
Another thing to remember: Copy one track to another and play them both back together. You will see a 3dB boost in the output even if the two tracks are unchanged. Look for tracks in the mix that stack in this fashion. This may help since your problems are in the mixdown.
One last thing to try: If you have the Cakewalk VST adapter, you can use Insector (
http://www.elementalaudio.com/products/inspector/index.html) in both Cakewalk and CEP. Inspector is FREE (adapter is not) and SO USEFUL for finding peak level/tone problems. Check it out. Good luck.