These are CM raids and they're self-imposing restrictions on themselves to make it harder..... They're also running comps that are way more DPS focused (e.g. way more glassy, way more easy to die) as they're trying for speed runs, not to just finish the boss. The newest Raid wing was so easy groups were able to figure out the mechanics and beat them in a day, whereas previous raid wings took quite awhile before a group could do it and figure out the proper comps, proper mechanics etc (still IMO not long enough especially for CM). Raids are NOT difficult out of the box. If they're difficult for your guild it's either a comp issue or a lack of understanding of skill mechanics, or both. If you're taking your build from meta battle there's a good list of the proper rotations you should be trying to follow to optimize your dps, support etc. Basically... a learn to play issue if what I read from your post...