Looks fine to me. Are the OTs/raid getting the Iron Construct adds shattered in a timely manner? We generally keep no more than 2 up. If there are 3-4 up the damage buff might be getting ahead of your healers.
I really dont see any issue with your gear, worst you can put on gossomar instead of lavanthors for another 2k ish health. Issue is each construct gives him 15% dmg boost (number can be different i am not sure), 3 of them up at a time and he begins 1 shotting AFAIK.