Nice looking corset overall, and I love the colour! The problem you mention with the chest is why it's important to have someone fit you properly and make muslins or toiles. It is almost impossible to fit yourself adequately. A dressmaker's dummy just doesn't work for something that has to fit as well as a corset.
BTW: if you get blood on fabric as you are working, the best remover is your own saliva! Sounds gross, but put spit onto a piece of cloth (colourproof!) and blot the stain. Comes out like magic as long as you get to it right away!