Cheers, fellas - good to know it's not just me with the super tight Highlighter sleeve.
I've taken to simply storing the wax in the middle of the gatefold. The inner sleeves offer sufficient protection from dust etc. and the numbered die-cut band around the sleeve is snug enough to ensure nothing falls out when taking the album off the shelf. Problem solved.
Good catch with the grapics on the Fragments 45, Po. It's even more obious when you compare the backsides of both covers, so even without credits or his logo to confirm it I'd say there's a ~98% chance of Mr. Buckingham being responsible for the TGOS#2 cover design.