Hello,
Thoses mods work. I heard (in the commentary section of the mod) that winterweight had some light problems, tho.
Use Vortex to auto-install devourment factor prerequises, as indicated in the mod page. Follow step by step all the requirements (like manually building bodys in bodyslide !) needed for both mods to work.
Be careful to be on the anniversary update of skyrim (and not the SE downscaler mod) in order to let devourment works.
Thoses two mods work greatly with each other and are complementary.
Now there is thoses 2 posts with lists and talkings of mod related to skyrim that may give you answers:
List of Skyrim Mods for weight gain
and
Skyrim weight gain thread mod