HI there,
when i did the cluster feeds I did 4,6 and 8 but it did mean bottle before bath which ds didn't mind. But I don't think it matter when you do them really as the objective is to tank them up. If you do cluster at 9 just make sure your df is on the later side, say 11. I dropped the cluster at 7 weeks as ds was taking more and moved the 6 feed to 7 before bed which works great. I have during gs clustered at 7 before bed then at 9, kind of like a df then df at 11.
Emma xxx