Seems to work for you, but do you do exercises at all where your elbows are not locked in? My elbows would kill me if I only did barbell stuff and pullups. So you tell me that while doing rows/pullups/pulldowns you fail your last rep because you had no strength left in your biceps and not your back? And yeah I am not talking about pre-fatiguing but the exercises done in a normal way. Crazy. Goes against everything I have experienced and read up till now, but you obviously seem to have more experience.