what do you mean by 'stacking'?
i went there yesterday - i know what you mean about the feeling re the superman loop, but i thought that was awesome - what i would expect to feel when doing a loop the loop! probably my favourite ride there...
one ride you didnt mention was the rapids one (think it was called raging rapids?) - sure it isnt a coaster but was fun... you get SO wet - the most wet I have ever been on a ride of that type! Thankfully I had my swimmers on and it was a hot day...
re fastlane (i think its called the flash pass now) - its a little overrated i think. I had it yesterday and yes, while it was good, especially if you only have a day in the area (as opposed to a season!), its not very reliable and more often than not, forces you to still queue up a bit before going on the ride (for instance Dark Knight, Batman, V2 - but particularly Batman). Sometimes it would tell you the wait is greater than an hour and when you get there its not even 10mins!
oh yeah; you didn't miss anything not going on the Dark Knight ride...