DanielTulip... and muddy tone???... nahhh..
When stacking octaves, I find that I have play around with the levels to find space for everything to sit well; this is especially important I find when stacking more than 2 octaves and/or fuzzing them out. It seems like some fuzz's can't take too wide of a frequency spectrum at once with out muddying up, or kinda farting/blowing out. I'd try lowering the octave and/or trying different fuzz's (unless you're set on a certain fuzz sound). I can generally get away with lower +oct levels while still getting enough volume out of them, though ymmv.
