If one's following #20 post > #19 post, there's no way to conceivably have the latter at less than 66% of SSJ Vegeta unless you nerf the hell outta some gaps. For example:
Android #19 (post) 66
Android #20 (post) 72
Piccolo 82.5
Trunks SSJ 92
Goku SSJ 96
Vegeta SSJ 100
The problem is that those pull #18 and #17 up when you adhere to the 2x boost for the fusion/merge with Kami... and I don't like having #18 more than 1.33x stronger than Vegeta SSJ. Her being 1.5x above Vegeta is really pushing it when her feats against Vegeta don't look as severe as a 1.5x gap. And I also don't like having her out of rivalry range compared to #17, due to #16 stating Piccolo does rival both androids, plus the duo being grouped together on a lot of occasions. Plus #20 post being at 87% of Piccolo, which can work, but meh.