Oh yeah! The new Hollowtech II technology is incredble, dude. LX Hollowtech II cranksets are so rigid and strong compared to the Alivio. It will reduce the annoying chain-rub to the front derailleur.
I'm 190 and when I used non integrated cranks, I could set the FrDer to where it wouldn't rub when you have the bike in a stand. When i actually stand up on the cranks and put some weight on them, it would rub on the OS. When I adj. the barrell adj. to compensate, then it would rub on the inside. With HTII's, I don't have that issue. Integrated BB's make for a more rigid crank that doesn't flext like my old ISIS and square taper cranksets.
I'm sure the same would be with a very nice ISIS DH crankset that uses a heavy duty ISIS BB.
Does that make more sense? I see your confusion about my statement. I should have broken it down better for ya.