Some Suggestions, on Re-Evaluation:
Icicle Stinger is pretty overweighted. It is not harder than any of the 14* maps, it's just kind of fast. Consider the tier it is in, it is with Hold Angel, which is a league above it, imho. Icicle Stinger hardly has any hard patterns, and is reliant solely on it's BPM to be considered "difficult". It has about 40 S ranks atm, compared to "Chaos Time" which is a similarly fast map, which is a tier below. I am suggesting it be moved to 13*. 13 hasn't been used enough, so the next two maps I'm going to suggest should also move
Yggdrasil is a map that by far has a huge diff-spike over any of the other 12* maps. I believe it's a lot harder to FC, but if you are considering that the first 3/4 is super easy, maybe keep it in 12, but I think that huge spike makes it a 13* map, kind of like Lawn Wake, it has a very complex 1/6 spammy part. It's like Bassdrop Freaks but 50 bpm faster, which is kind of absurd
Central Nucleus is by far the most complex 1/6 map in the 12* bunch, and doesn't really fit with things like Invoker, which just has a pretty short burst of 1/6 put over the map. The map is also really poor performing with Mods, which should add it to being considerably more difficult since it would be leagues easier to read with something like HR, but at NM and the base 180 BPM, it can be tough to read some of the patterns. It has far less FC than the other 12's.
New maps:
Rhytoly's Happppy Song: 12*
This map is highly comparable to "Uta" in the same category. Long streams, light and simple 1/6
Midnaait's Bison Charge: 11*
Normal map with a really long stream, some hard parts, but not super hard.
Kuron-Kun's 1,2 Jump!: 10*
This map is just like Last Fortune and Sunshine.