Eric,
I am curious just how heavy are you training? I am or will hit a row with uo to 365 for 5 reps. I never go over 3 sets of any exercise. Usually in the 2nd day after a back workout my lats are failry sore. I have a feeling either you are now pushing it to failure for all three sets or your deploying that pyramid nonscense. Where by the time you hit your heaviest set you are too wasted to get any quality reps. I do a reverse pyramid much like 0311 takls about. Remember your always strongest at the beginning of an exercise. I have a gut feeling your are not doing as low of sets as I am. Also if you are doing body parts over once a week and going to failure with massive weights you would be a physical wreak after a fe months of this. I have personaly never seen a person that goes all out with the same muscle twice a week go that heavy unles he is a roided up Coleman trainer. I am curious how you are doing this. If so, you have the most amazing recovery system on a natural guy. If you are not up to super heavy weights and all out failure I can see how one can train constantly but once you are hitting above 85% max with sets in the 5 to 6 reps I think not, No offense.