first of all, dont any of you new members know how to use the search function? we answer this question at least 5 times a week.
and the answer is...
leaves are the solar power generators of your plant, buds are the storage facilities. eliminate the first and the need for the second is less.
try this, cut off those lower shaded buds but leave the leaves. this forces the plant to send any energy collected by those shaded leaves(even shaded they are getting light) to the upper buds. the end result will be less airy lower buds and bigger, denser top buds.
for your next question, try the search function first.