Sorry fellas, but muscles can not be shaped. the 'cut' under the pectoralis minor would be from diet, not dips....
You have what god gave you - it is up to you to carve it. If your upper chest is bigger, it will always be - you will never 'bring up' a weaker body part that is part of same body part (pecs are pecs). You can not isolate the minor from the major. They are not delts.