Yea that's the normal size imo.
Mine also around that size.
You can only activate either DHH or Graphic Mod.
DHH usually for performance and Graphic for the quality.
Graphic also supports SSS that needed for Hanmen's Next Gen Skin Shader.
The mods inside /Mods/MyMods should be the mods that you procured by yourself. Either its paid or something not included in the repack.
It doesnt really matter actually if you dont update the mode using updater program like KKManager or BDSM (like me

).
Updater here works by syncing your mod directory with this
You must be registered to see the links
. So if you put the Sideloader mods in /MyMods, you will be asked to redownload it again because the updater can't find the mods in the folder where it should be.