Hello. Long time player here ,(to be precise since 2012).
My suggestion :
Either give the 30% buff to icc or nerf some fights a bit.
(I.E. DBS pretty much oneshots anyone under 20k hp (like a mage etc) if the individual is unlucky enough to get bloodboil AND bloodnova)
Why:
I understand the point of the buffs (in some cases the absence of buffs) is to make content more challenging.
BUT!
This is actually bringing forth a requirment of higher gear than the one you are actually raiding . IE in the end of the day you need to have a lot of 264ilvl items to be able to progress in a raid which gives you 251.
YES people are clearing ICC , i understand this, but most of them are either people who have been farming 2 or 3 first bosses of icc for MONTHS or were there in XMAS events and got geared by there.
The point of raiding isnt just to go in there as overgeared as possible. You go there for upgrades, and with current state , until you can actually "farm" these upgrades, you dont need them anymore...

