Great effort on this, looks well nasty!
Re Liquid Amber and Hubble its worth noting that when climbed, there were no other 8c+ or 9a routes to compare them against so it was only natural that they were given only one grade up from the existing testpieces of the day. It is only the passage of history that allows us to judge their true difficulty relative to other later famous climbs that may have been given higher grades even though they were possibly no harder. As LA and Hubble have had so few repeats by climbers who have also done the more well know European 8c+'s/9a's of the mid 90's, we are really none the wiser as regards their true grade and what amazing achievments they were for their time. As for Superman, this may have been the first ever font 8a+ when it was done in 1988 although I am no historian in these matters. Is it now 8b? I know Tim Clifford repeated it post sidepull snappage.