Alright, let me repeat myself.
I made absolutely sure all the posted clips PEAK at -13 DB. Their averages may be different, but at no time does any clip exceed -13DB. Guitars may be percieved as louder because the drums were lower in the mix, or guitars may be perceived as louder because they were compressed significantly, or guitars may be perceived louder due to more high end in the EQing.
All clips peak at -13 DB, so no clip is louder than another. Guitars may be louder in a mix, but it still won't exceed - 13 DB. I know this, because my ears are bleeding from adjusting all the volumes. Some of you people sent me clips averaging -8 db peaking at -2...I adjusted all volumes to be -13 db peaked.