it was an unlucky start for all of you apparently.Stressful germination and insufficient feeding caused weak side growth,that's why buds are small as you said.But this is a beautiful scrog,congrats.More fertilizers wouldn't do anything at this point as you seem to be so close to harvest.Strong veg growth means strong bud production but no problem,still decent quality buds there.It only cost you some yield,that's all.