Managed to do all but 1 of the AR Training Missions, I was stuck on Advanced AR1 (Steel Mill). Alas, after the best part of 14 months, finally done it thanks to a cracking Video Guide. Took me 3 attempts to finally nail it after watching said video, it's all about releasing the Dive Button and then adjusting Batman when you go through the tunnel.
Skip to 4:10 for Advanced AR1, I take no credit for the video, that's down to BatmanArkhamVideos.