>>2857865There's always a bigger fish.
The only solution to that is reweighing the hip joints. There are various methods that would be pointless to explain in text, I'll just point you to some public models that have it covered: Izumi Shimizu, HK base models (HK03_v01e), Quappa-EL models (e.g., EL-Pr225), tamo models (e.g., im11393498), and ジャンヌオルタ(水着)ver.0.93 uses a really unorthodox solution that looks pointlessly cumbersome after comparing it to those I've named. Study their methods of weighing hip joints and transfer to your target model. Unless you can manage such a complex task with BDEF4_recoat from na7plugins, you will need Blender with mmd_tools.