I am with you. I used to love listening to Knebworth, but now it doesn't seem to have a normal concert flow or feel to it. I like the '80 tour better because you can hear more of the band comradery in the shows. O2 show kinda feels like Knebworth to me also. Anyway, just my opinion.
As far as underappreciated shows, I was listening to the first Dallas '75 show last night and boy are they cookin'!! Especially Over The Hills... an amazing version. Robert seems to get very pissed at the audience that night.