Fresh 25 man guild Progression

[Destroxo]

Hey guys, we have recently just formed a 25 man guild from what was an old Core 10 from ToT.

Our progression in H ToT was 4/13 before patch, mainly couldn't get any new bosses down due to having to regear core spots such as a few dps, a main tank and a healer.

However we have finally struggled through and have successfully formed a 25 man that has been raiding with around 20 core, 4-5 trials and something a Sub from the guild (usually carrying 2-3 dps)

We managed to kill the following in 25 man SoO:

1 shot Immerseus
1 shot Protectors
10 or so attempts on Noru (By far the hardest fight we've encountered in SoO so far, not sure if it is tuned higher for 25 man)
3 shot Sha
5 shot Galakras
2 shot Iron Jugger
Progressing on Dark Shaman

6/14 Normal over 3 raid nights spanning around 3 hours each (2 and a half considering down times/not all core being on).

So for 7 and a half hours of raiding do you guys think this is a decent progression for a very fresh 25 man guild. There does not seem to be many 25 mans at all anymore and this has been my first 25 man since BC Hardcore raiding. Note: We are 5/9 on our server for 25 mans.

I personally found that even including Dark Shaman the hardest fight was Norushen just due to the add management/working out a strat (We only 4 healed it)

Dark Shammy also seems relatively easy and we only got around 1 hours worth of attempts on it last night and will use a non-raid night (tonight) to push forward with a 10 man Core team. Does anyone have any advice for a 25 man pushing through the next few bosses, any bosses you think we will struggle on?