It's very simple. The caap over complicates it. If you are going to make a turn in circuit direction do so at 500-1000 Agl to make 30 or so degree intercept with the outbound track. Don't fly square circuit legs until intercept. If you depart over head then same thing however one continuous turn towards your outboard track which places you overhead. Usually only do if say you take off to the north and your outbound track is SE. If it's a turn contrary to the circuit it's exactly the same as turning in circuit direction(30-45 degree intercept) just wait until circuit plus 500 or 3nm. Easy....