Questions

I have a prominent chest (muscle) and a rather flat back (I don´t know if it is due to an erect posture, if so it´s just slightly)

When I wrap a tape measure around my chest (perfectly parallel to the ground) there is an excess of 1/2" from the top of my shoulder compared to the back.

Do I simply lengthen the frontpanel by half an inch or what do I do? Is my measuring technique even the right method to find out my "balance" or do I forget something?

Thanks in advance :)