To be honest Shudderwock is the real problem. It was a really problematic card even from Witchwood.
If anything deserves nerf to oblivion it's this card. But since Blizzard avoids nerfing expensive cards, yes the Shaman invokers will be more expensive and perhaps the rushers will be fewer.
2
I like your changes my secret brother)
I have also take out Desperate Measures . It feels very bad card most of the time.
I really like how Noble Sacrifice works together with Autodefense Matrix living the original attacked minions with a Divine Shield and it is really good against aggro decks thats why i am running 2 copies of it. But i agree with that it is up to everyone to choose what secrets to put in and i dont think that the difference will be so noticable. As you said the right timing is crusial about playing secrets.
Cristology will be buffed in 1 mana card and i think 1 copy of it will be very strong in this deck. Imagine drawing turn 1 your 2 Secret Keepers for 1 mana. The game is over )