Wow Polecat....for the first time in a long time, I'm going to have to disagree with you //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif
Changing your crossover points (and slopes if possible) as well as the relative output levels of your mids to your sub should help bring the sub sound upfront with you. Just because you have your mids highpassed at 80hz DOESN'T mean you need to lowpass your sub at 80hz. It shouldn't sound like it's coming from behind you, even though that's where it is located. And bass isn't non-directional, it's omni-directional //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
A major problem can also be resonances. If you hear any rattling or vibrating behind you, then that also is going to "pull" the sound back behind. So, be sure to knock out any resonances or vibrations that you may be hearing.
Also, the sub doesn't necessarily need to be behind you. Plenty of systems have a front mounted sub.