God I hate Catadioptric so much. TELL ME HOW YOU CAPTURE IT PLEASE SERIOUSLY. Every time I play EoSD I either die or bomb the card, I have yet to capture it. ;_;
Also who do you scorerun Flandre with?
The basic pattern to Catadioptric is three quarters of the way to the right of the screen, all the way to the right, three quarters of the way, all the way, etc, so that you avoid most of the big clusters. Other than that, the most important thing is to be looking at the huge-hitbox'd fat bullets
as early as you possibly can; most of my deaths to Catadioptric are clipdeaths from a big bullet that was off to the side of the cluster. Finally, there are a load of really slow small bullets that will stay there to annoy you from previous waves, so, err, watch out for those, I guess. :V
Here's a video of a capture; at 4:04 there's one of the nasty outlying fat bullets which
will get you killed, so pay attention to those as your top priority.
And my scoreruns so far are with MarisaB; I don't really have any particular preference, but I'm participating in the tournament thingybob which forces MarisaB, so yeah. At any rate, Master Spark is very useful for collecting a load of point items you'd have no chance at otherwise, so I'd probably end up sticking with this shot type.