I did use that preset, all i did was reduce the breast size. i will just use this on the normal cbbe later on.
edit: ohh i see why, i have a mod installed to make your character a teenager.
so it reduces the size a lot. i uninstalled it and it looks normal now. my bad. i forgot to remove it.
you can rezise yourself using console command: setscale ( not permanent (idk how write that in english lol) ) and modscale (permanent): like setmodscale -0.01 (you will got little) by example or setmoscale 0.01 (you will get high), im using setmodscale command so its not auto resize to regular scale when exit power armor. Sorry about that wall of text and horrible grammar, im not english native speaker and just tried help so you can use bodyslide and being teen without using a mod for that just need use modscale command.
**Obs: save before, try a size you like after taking that size test at game and at terminals, so if not goes good you can back just need use the save.