Not really sure what I'm missing here. My main issue is pretty simple: I downloaded one of Ola's full Feared tracks to work on my mixing, and used a lot of VST amp sims with his guitar tracks to great results. I tried to do this with my own playing, and it came out sounding very anemic, low gain, and fizzy.
Now, my understanding is that Ola's files are DI'd, so I bought a DI box hoping to fix that. Since the DI box I have only has an XLR out, my signal path looks like this:
Guitar - DI - M-Audio FireWire Solo - Mac
Same problem is still there, even with owning the DI box now. I know the tone will be inherently different from his playing and mine, but it's a matter of night and day. If you guys need soundclips, it shouldn't be a problem at all.
Sound clips would help, but my first instinct is your guitars sound different due to the differences in his and your playing, how they're layered, and what kind of guitar you're using.