"through my training my instructors always told me for the line up behind calls to read that back in full"
The power of the instructors' word - it's hard to avoid perpetuating furphies, and I'd be as guilty as anyone here, but a good look through the AIP on points of order sometimes coughs up a few surprises!
Hard to keep track of all this stuff, though, and the 'line up behind' thing being read back once only stuck in my mind because there was a special notice sent around by CASA when it came in, as I remember.