

My guess is some firmware or modules that just makes it that big and if you want room for snapshots you need to resize (or uninstall some variant if not needed). OS installer might have too small default size for a setup like this.
300MBish for a kernel is totally normal and you have 3 variants installed.


NFS works great for media files and stuff but be careful and know what you are doing before you go put database storage on it.