There probably isn’t a single person - bodybuilder or not - who doesn’t know of a weak point on his/her body. The human body is built in way that it seldom develops in an absolutely symmetric manner. A good way to discover such weak areas for an advanced bodybuilder is to spend a lot of time looking at him/herself in the mirror, or to have photos taken of his/her body and later analyze them.
People in the gym can also provide valuable feedback in this respect.
The most annoying thing about weak areas is the fact that there is some kind of force that drives people to disregard and ignore them.
It is often the case in gyms to see a person with a well developed set of pecs insisting a whole lot more on bench-presses than on anything else. This is a psychological matter and as such that much harder to tackle. It is only natural that someone feels more attracted to something he/she can take a lot more satisfaction in. Weaker areas do not only appear weaker, they generally are, thus the satisfaction of training them is basically non existent compared to other - better developed - areas.
A bodybuilder, however, who wants to take his game onto a higher level, has no choice but to tackle these problems. The psychological implications of this are quite intricate as often times one will perceive working on the weak areas as starting over.
Admitting the existence of a weak area is a good first step in its elimination. The second step should be the pinpointing of the cause of the problem. Third step: tackling it. The exercise program should be bent in a way that facilitates extra focus on these areas. There are a number of methods that can be deployed against these “pests”.
In case the weak area’s existence is due to under-stimulation the priority principle is a good way to take up arms against it.
Always start your training session with the muscle-group in question and hit it with maximum intensity. Your double-split system can also be adjusted so that the weak area is hit exclusively in one of the half-sessions you perform.
The staggered system is also a good approach to the weak-area issue. Squeeze in an extra set for your weak muscle-group between two sets of your regular training.
If the problem is caused by overtraining, the obvious answer is to cut back on the number of sets per weak area, give it more time to recover, then shift your whole training program so as to avoid future overtraining.
Given the fact that the muscle-group in question still needs a thorough workout try hitting it with shorter bursts of very intense sets.
At any rate, never choose to ignore a weak area. That won’t make it go away. Pinpoint it, admit its existence, locate the cause then go to the gym and solve the problem.