No offense to your agile, but I've tried recording a few bands with them, they were dropped to A.. It sounded like shit. I then recorded the same thing, having them use my carvin with painkillers in it, and the problem was gone. I then had them use a standard mahogany/emgPU guitar, and it sounded better than the agile as well.
It's not your guitar, necessarily but probably the fact that you have the stock pickups in it.
The stock pickups in my 828 are based on Lundgren M8s. Some people like them and some people don't. As stock pups go, I think they are very good. I know that some people prefer a BKP Warpig or a Cold Sweat in their 8s, but I personally can't rationalize the expense given the quality of the stock pup in there now.
String gauge is another important factor here as well. Right now my low E is a .072 or .075, I can't remember, but I'm happy w/ the gauge.
Good guitar tones are, of course, a highly subjective thing, as we all know. For instance, some people like actives and some people prefer passives. I had a guitar w/ actives in it, a Schecter Hellraiser, and I never could get a tone I liked out of it. This doesn't men that someone couldn't, it just means that EMGs just aren't my thing.
Getting back to the original point of my thread, I found that my 828 has responded best to the HiBrit sim. The other ones I tried, Lecto, 456, LeGION, Juicy 77, Preampus C-15 and 60, and the X30s, worked fine when I kept things above C#, but weren't giving me the results I was looking for when I was using all 8 strings.