Regarding the location of the cluster you can just slide the bars forward with festooning bees attached. We did this two days ago with the fellow that I am mentoring. We direct released two queens in his hives three days earlier. One clustered at the front, one at the back. For the one that began at the back we just removed the front bars, slid the back bars (5 of them) forward as a group, refilled the feeder and moved it forward to the back of the cluster and closed the hive up. Checked it today, all good.