There are 100 different ways to light this shot. The angle and composition is actually really symmetrical. That's good...it's a good angle so there is no reason to change it. Look at the shadows coming from the chairs. The shadows are coming from too many different directions. There is no single dominant direction. This is your number one problem....the light is completely without direction.
Like I said, there are 100 different to light this shot...I can give you one simple idea for a setup that may help. Do you have regular reflectors for the heads? IF so, remove all the softboxe from the heads and replace them with standard reflectors.
Next, take one head with a standard reflector and use it as a mainlight. Put it up high on a stand and point it down towards the table. Move it around the table until you find a position where the direct light coming from the standard reflector shows the texture in the wood grain well while simultaneously creates a pleasing shadow from the table and chairs. When you find the right position for the light, take a meter reading from the table to determine the exposure.
The shadows will of course be deep and dark. So, the next thing to do is fill in the shadows. This is a relatively large set and will probably take the remaining three lights to be used as fill lights.
Is the ceiling a light color and is it at a relatively average height? If so, a smooth fill light can be accomplished by bouncing the remaining 3 heads off of the ceiling. Try setting up the remaining 3 lights high on the stands and pointed up towards the ceiling. Set one of them close to camera position and point it up to bounce off the ceiling and onto the table. Then place one light high on a stand to bounce light into the right side of the table....and place the last remaining light high on a stand to bounce light into the left side of the set.
Set all 3 bounce lights to the same power settings. Try and get it so they all fire at the same time and are about 1 stop to 2 stops less power than the mainlight. This will make a 1:2 or 1:3 ratio between the mainlight and fill.
This will require 2 separate meter readings. One reading will be for the mainlight. It will determine the exposure. The second reading will be for the fill light. The fill lights should be set at about 1-2 stops less exposure than the mainlight.
Basically, one head with a reflector will be the mainlight. This head will determine the direction of the lighting scheme and it will be positioned in such a way that brings out the best texture and detail on the top of the table. The remaining 3 heads will become fill lights. Their only job is to fill in the shadows created by the mainlight. These 3 fill lights have to be positioned on all sides of the set (front, left, right) in order to have the most even coverage of fill light for the entire table and cove. The ratio between the mainlight and fill light should be about 1:2 or 1:3
Hope that my explanation makes sense....Maybe it can help give some ideas. Like I said, there are 100 ways to light this set...so it's all a matter of interpretation. But the number one problem you currently have is a total lack of direction to the lighting.
