Technic can be tricky (at least I think so) when it comes to removing mods from a modpack, Twitch is ok but FTB can be good for the major and optional you can select or ignore.
I'd say look at the mods careful like those that have cores or world gen related as they will be the ones that can be very important to add for support of other mods (special code that is required for the mod to run or optional things but usually important requirements) or dangerous to remove.
I'll take a look at the pack and see what I find. Otherwise if you state the mods you want to keep that would be great so you get the experience you want.
I attempted to and wasn't able to download it so could you give a modlist of sorts so I can assist with this.