Hi Merinicus!
I'm currently 11/13 heroic 25, and really in this reply I wanted to focus more on the strategy you are using and raid movement as a whole rather than on individual performances. From what it sounds like, you really are getting the basics down which is great, but there are a few key areas that will need to improve before you get a kill.
I will liken your situation with gear currently to my guilds on heroic Chogall: It took lots of attempts, was very frustrating and lots of time was wasted for one reason:
Corruption.
If you get one or two people with corruption, then it's manageable. If you have more than that, then you will wipe even if you manage to get into P2 from the sheer amount of extra damage the raid as a whole is taking. I would say have a few attempts just focusing on avoiding that shadow crash. I notice you have 2 priests, I take it one is holy and the other is disc. Make sure the target of shadow crash gets body and soul or a life grip as these are extremely effective tools if used correctly.
Are the adds dying fast enough? Are you having people getting MCed whilst not being grouped? Is it really required for your rogue to be on the adds if they die quick enough? Remember that even one person getting lots of corruption is really bad, as it increases the raids damage taken by a huge amount. If the rogue can't DPS the adds and avoid getting corruption, then leave it to the ranged. Really shouldn't be a problem if you have as many traps and CDs lined up like you say you do. Remember as well that if he's nearly on 25% and an add is up, just push him into P2 and offtank the add.
Now finally, 40-50 attempts on a boss is loads for a casual guild, but this is a tough boss fight, easily the hardest normal mode end boss. Keep at it and don't wipe without asking why? how? what can we do next time to avoid another wipe? Was it bad luck, bad positioning? All sorts of things can go wrong, but when you know what it is that is going wrong then you can work on it. After looking over all your details, corruption is the only thing that screams out to me. On my first kill of chogall normal we wiped quite a bit due to high corruption being mostly unhealable. Last attempt with no corruption, healers finished with everyone topped and mana in their bars. It really is the game breaker.
Hope you found this helpful! PM me if you want any more