First of all, I believe there's a Lucy in FS2 (not the Derelict one). What's its weapons there?
Secondly, the damage ratings between FS1 and FS2 are different. How do I know that? The Prometheus in FS1 and the the Prometheus S in FS2 are the same weapon. If you look at the tables, the Prometheus S is stronger in FS2.
Thirdly, the only reason why the Shivan Superlaser could potentally be dodged is because :V: hadn't implemented beams into FS1 and just used a modified missile trail.
Finally, wasn't a sexp used to kill the things the Lucy shot at quicker? Maybe they wanted to make it even more powerful?