Hey Jonas,
I'm pretty sure that as3 swfs only include the trace statements if your debug flag is set to true. AsProject is reading those statements directly from the flash player log file, so if they don't get sent, we can't read them.
FDB is probably somewhat helpful, but like you, I find it's interface pretty clunky. I've been considering some kind of easier ruby/shell front end but haven't found the time for it and FCSH support is definitely higher on my personal priority list.
Please let us know as you find out more on this front.
Thanks,
Luke Bayes