Eviscerate damage lowered?

I just hopped back into Deathwing these days on my lvl 70 bis twink rogue, which I've been playing since wipe. I can thus guarantee I have experience with the numbers my "baby" can output.

I immediately noticed something wrong with the damage I was doing.
First of all my bleeds didn't seem as effective as they used to be. When I encountered other level 70 players, I would most of the times take them to 50% hp, put http://wotlk.openwow.com/spell=26867 and http://wotlk.openwow.com/spell=26884 up, then vanish and watch them bleed to death from the shadows. The magic crit tick I know my rogue would do, was 990, but this time I wasn't getting that. Instead I was only getting 798.
After a series of tests I came to the conclusion that the +20% ability damage increase due to the Subtlety talent http://wotlk.openwow.com/spell=14083 does not step in when targets go lower than 35% hp anymore (if initially applied while target was >35% hp). I am not sure if that was a bug all along, but I had gotten used to it that way, and of course, I liked it :D
Bleed behavior has also changed in regards to procs. The bleed now does the damage according to what its initial state was. If you have 1 second of http://wotlk.openwow.com/spell=59621 left, then it will take into consideration that extra 400AP for the entirety of the bleed duration, but if it happens to proc while bleed had already been applied damage does not increase. Same goes for http://wotlk.openwow.com/item=38925 .

Secondly, and the most important problem, http://wotlk.openwow.com/spell=48668 is now tuned down a lot.. It makes me cry to see how a full 5 combo points http://wotlk.openwow.com/spell=48668 crit now only barely does about 70% of the damage http://wotlk.openwow.com/spell=48689 does. Pre-update they did roughly equal damage, and doing the http://wotlk.openwow.com/spell=14183 -> http://wotlk.openwow.com/spell=36554 -> http://wotlk.openwow.com/spell=48689 -> 5cbp http://wotlk.openwow.com/spell=48668 -> http://wotlk.openwow.com/spell=54757 combo would easilly "one second shot" any lvl 70, even 75 , especially if http://wotlk.openwow.com/spell=48668 was a crit too.

So I guess my main goal is not to complain about anything, but ask you other rogues if you've noticed anything suspicious in the way your beloved toons now behave, after the update, and if all this is normal and it should have always been expected of rogues to behave.

Cheers and keep on ganking!