Regarding the source, I think even if the game updates its name, it's okay to keep the old source if that was the source when this song was released. If this song was released after Kantai Collection's official name change, then I think source should be changed. But I believe this song was released with the original (and current) source.
For example, when considering rhythm game songs that are featured in different games, we always use the first instance where the song is officially featured, even if it may not be where the song became the most popular. Say, the song was first released in jubeat, but became popular in reflec beat, we'd still use jubeat as source. I think we can apply that here, where we use the first instance that the song is officially featured as the source. Of course, it's debatable, and KwaN's proposal makes sense too. I just want to bring this up for discussion before we decide to change sources.
Regarding the spread, I agree that Normal is a bit dense, but I think, considering the jumps and triplets used in Hard, the spread even's out a bit. I worry that trimming down too much of the Normal will create a difficulty gap with Hard, not so much because of a rhythm disparity, but because Hard also introduces a lot of jumps while Normal still respects uniform DS. The current spread is pushing it a bit, (minimal trimming would improve it) but I think it's still acceptable.
My opinions anyways. Good luck on the requal Satellite!