Blessedatlast, don't stress too much. All seats still have to pass the Australian standards so it's hard to get a really crap seat. You've done the best thing keeping him Rfing as long as possible. I personally wouldn't rush to turn him. Is the model you have the same as the one tested? Or could it be the older model.

This is from the CREP website - "Because the testing methods used in 2012 and the previous years are different, it is not possible to directly compare these latest 2012 test results with earlier results."

So if your seat tested well last year it doesn't make it a bad seat now as the testing is different IYKWIM.