Listen and listen closely.
You are wrong on all accounts.
You think you are better then the raid, but you are one person.
Your group isn't up to the task.
The problem here is not the raid it is you.
You are the one who knows/feels he should be able to do it but your raid group is holding you back.
No raid should be able to be cleared by your grandma and 2 drunks unless they put in some effort, well maybe LFR.
Normal is progression orientated raid size as much is heroic and mythic just because you refuse to except it doesn't change the fact that it is.
I have no problem understanding that normal is supposed to be piss easy, seems like the people in the group you lead are the ones with the problem.
This by it self tough isn't an extension of overtuned content is is simply lack of effort/skill.
You do not need to clear heroic to do normal.
I'm 100% sure that there normal guilds out there progressing on ToV the way they should by not having overgeared characters blast trough the place.
And btw normal is missing few key mechanics as well so i still the problem is you not the content, or more so your raid group refusing to actually adapt put a tiny fraction of effort and just yelling "OVERTUNED" .
Know your raids groups place and don't jump 2 high if you don't want your legs cut off - thats a saying i just made up but feels goddamn accurate for people like you.