You should be using the latest revision from VW - I believe I am on revision K on my Stage 3. The later revisions solved some issues that APR Stage 2 maps suffered from at the top end.
I have also seen some people use the RS3 Coilpacks. Yet to see any evidence that proves one is better than the other: https://www.uspmotorsports.com/Engine/Ignition/Audi-RS3-OEM-Coil-Pack.html