..let's take GH3 part Flora series for example; the answer is no. However some people use what's called the Lucas formula which uses just two parts, the bloom and the micro successfully
Nice work! Sunshine 4 just needs feeding after the seedling stage like pro mix. Not much nutrients included like ocean forest or similar. And its designed for fertilizing regularly. Good drainage.
At this point you could likely use the bloom but only if it includes the micro nutrients and trace elements. Like advised above by @Beachwalker
a plant needs little "n" untill middle flower - at one time there was a no "n' in flower, times have changed - Now if you are talking about bloom booster, yes, they are needed for increasing terpenes' and essential oils suggest using yopur 3 part bloom in flower