Start with the pocket, not the pattern
In FL Studio, put the kick and snare down before opening the hat menu. Pick the smallest loop that gives the song a pulse, then listen for the places where a vocal could breathe. If the rhythm already feels complete without a voice, it may be doing too much.
A useful first pass is one kick idea, one snare or clap, and a hat with a little variation. Keep the main hits close to the grid, then move only the notes that need a human push. The goal is controlled movement, not random looseness.
Use velocity as arrangement
The Piano roll is more than a note-placement tool. Velocity can separate the hits that carry the groove from the hits that simply keep time. Lower the repeated hat notes, then bring up one or two accents at the end of a phrase.
For a vocal-led record, leave the strongest accents where the singer is not competing with them. A quieter hat under a verse and a more open accent before the hook can create lift without adding another percussion layer.
Make one change at the section line
Duplicate the first four or eight bars, then change one thing when the section turns: remove the kick before the hook, open the hat for two beats, or let the snare hit alone. Small changes are easier to hear than a new drum kit every eight bars.
FAQ
Should FL Studio drums be perfectly on the grid?
Use the grid as the starting point. Keep the main kick and snare reliable, then move a small number of supporting notes for feel. If every hit is moved, the groove becomes hard to control; if none are moved, it can feel lifeless.