Pitts 2112 is my erstwhile display formation buddy, so no guesses that we fly similiarly!
One thing that was overlooked in all the previous posts was the "belly-check".
When I call turning final, from base - I always make it a practice to roll wings level once perpendicular to the runway and have a good bloody lok down the extended centre line in case someone is inbound!
The other thing is that if flying the circuit that 2112 mentions, I avoid a cone of danger displaced upwind and 30 degrees either side of centre line just in case I missed the guy on long final!
Stik