I'm of the 'if it ain't broke, don't fix it' world - if cluster feeding is working, stick with it.
If you are putting LO to bed for the night at 7pm, you'd feed at 6:30ish and then a DF at 10ish if you so choose. DF is ideally done about 3hr after asleep for the night as that's when its least likely to disturb LO's sleep.