An image of the problem would be very helpful. Is this basically an alignment problem or are you getting distortions across the seam? In the first case, making a template with color-coding can help you position the texture as you move from front to back. In the second case, I've found that making a large template (2048 X 2048 +) using 'Mapper and then keeping the texture small as it moves from front to back can minimize the seam.