btw my reason for not believing the official story has very little to do with witness accounts, which are subjective, possibly deliberately misleading, possibly politically biased, and nearly always subject to shock.

It's the speed at which those buildings fell. There's absolutely no doubt about how long it took, the only debate is whether that's possible due to the reasons given. And it is a debate. It has never been proven one way or the other. Nobody has replicated the events of that day, even scaled down, to satisfy those who have concerns. So it remains unanswered, all we can do is share opinions, some more qualified than others, but opinions nonetheless.