I think SSJ Gogeta is good where he's at, there is over 100 Billion Solar Systems in a Single Galaxy, I don't see SSJ Gogeta even reaching Small Galaxy level, the only reason SSJ4 Gogeta is at Galaxy level is because of the time skip in GT that makes Base Goku at the start of GT 400x stronger then Base Buu Arc counterpart, SSJ4 Gogeta is said to be dozens of times a regular SSJ4, since dozen is 12, 12 x 12 = 144, so SSJ4 Gogeta going by that statement at most would be 144x stronger then SSJ4 Goku, so SSJ Gogeta should be 144x SSJ Goku, since SSJ3 is 8x SSJ, 144 divided by 8 = 18, so SSJ Gogeta would be 18x stronger then SSJ3 Goku who is easily Multi-Solar System, but SSJ Gogeta would still be 4-A, but it would be on a higher scale then Goku, I have SSJ2 Goku around 1.5x Cell, SSJ3 is 4x SSJ2, so SSJ3 Goku would be 6x Cell, since SSJ Gogeta by my numbers would be 18x SSJ3 Goku, so 6 x 18 = 108, and 108 divided by 12 = 9, so SSJ Gogeta would be able to destroy 9 Dozen Solar Systems, or 108 of them, that's still impressive but no where near to be even considered Low 3-C, even Baby Vegeta is 4-A, and he was superior to GT SSJ3 Goku whom is 400x SSJ3 Goku (Buu Arc) in his 1st Form, I have 1st Form Baby Vegeta as 500x SSJ3 Goku (Buu Arc) making him 1.25x GT SSJ3 Goku, while I have his Final Form 1.5x his 1st, so 500 x 1.5 = 750, so I have Final Form Baby Vegeta 750x stronger then SSJ3 Goku (Buu Arc), while his Golden Oozaru Form would be 7,500x, while I would say GT SSJ4 Goku after gaining power from Gohan, Goten, Trunks and Pan would be 8,000x stronger then his SSJ3 Buu Arc counterpart, and even then, I don't think they got to Small Galaxy Level until Super 17 Arc according to this Wiki, even the Smallest Galaxies are Huge