Well, IMO, i was thinking into a more conservative scaling without the use of multipliers for AP (Sorry is measy, I'm on cellphone)
Dwarf Star level (1.7 Tenatons) 1st Form Frieza
At least High 5-A for 2nd and 3rd form Frieza (The previous calc isn't far beyond Small Star level)
Low 4-C for Final Form Frieza 50% and KKx20 Goku and the Spirit Bomb (Given the inmense jump in power)
Low 4-C Frieza 100% and SSJ Goku (Namek), Mecha Frieza and SSJ Trunks (Low 4-C has a big gap in power)
Likely Low 4-C Androids 19-20 (The likes of Gohan are well below Gero according to Piccolo, and, even before the 3 years training, Gohan could stagger 3rd Form Frieza, so I guess this is a fair rating)
Low 4-C+ Pre Training SSJ Goku, likely Piccolo post Training
4-C Post Training SSJ Goku, SSJ Vegeta, Androids 17-18, Piccolo-Kami, etc (The Androids are stronger than Vegeta, but not by an inmense margin)
4-C+ Imperfect Cell and Android 16 (Cell easily defeated Piccolo and 17)
High 4-C... Everyone from SemiPerfect Cell up to Super Perfect Cell basically
Large Star level (4.535 Foe) Shin (Who being honest, given that he is weaker than the Rusty SSJ Buu Saga Gohan, but not by much, and his terror of fighting Dabura, who is Perfect Cell level, he should be around ASSJ Vegeta if you ask me)