custom hands don't follow body sliders?

[MistressNocturne]

Hi, sorry ifthis has been asked before, but wondering if anyone has any idea on how to properly make it so that a custom pair of hands follow the body sliders right?
To explain, I've been making a pair of cartoon hands, and no matter what, when I test them, the wrists never seem to connect to the body, and it seems like an issue with the body sliders, for example one pair of hands I did for 9s Rhea would flip out when the hand size slider would be used, causingthe whole wrist to grow with it, similarly I feel like if I mess with the arm sliders or thickness or fat sliders, the wrists don't match... what am I doing wrong here?
 Hope I explained it well enough, and for refrence, I've been using the ebody, 9s, and the program I tend to use is Blender with the Onigiri add on (similar to bento buddy). Many Thanks in advance!