miz worried about di size

my girls are two weeks into flower,they stand four foot tall with very large
stems,they have leaves as big as dinner plates,every part of my girls are flowering.Im just worried if i have let them get to big?will they keep there
strenth,should i feed more than norm?what do you think,,,thanks

Some stretch all the way until harvest. Some stretch only a few weeks. You really won't know unless you know your strains.