What does it matter why I play Skyrim? I hate multiplayer games. I hated All Mass Effect games which I wasted money on. I did like Fallout three, but detested the ending. I like Fallout New Vegas, but I currently can't play it on my laptop for some reason. However, my all time favorite game was and still is Dragon Age Origins: although, I absolutely hated DA2.
I'm just curious. Because so far it's clear that you only enjoy the game when you use the console to break the leveling system. And even then, you seem to be upset that it doesn't have a leveling system like other games.
There are lots of single-player RPGs that offer the kind of level-grinding and kill-spreeing gameplay you seem to be looking for. I'm just wondering why you chose to play an open-world RPG that's built around exploration and has mechanics in place to deliberately discourage the kind of gameplay you want to have.
And as for your sneak problem: your issue is that you aren't perked. Sneak attacks are designed to be devastating, hopefully-one-shot kills. If it fails, then you're probably going to be screwed. Especially if you used the console to level your skills so that you're still unperked. I promise you that most, if not all, of your problems with survivability would disappear if you didn't cheat. And while there's nothing wrong with combining Sneak and Heavy Armor, you're making things harder for yourself, because Sneak works best with Light Armor (less noise, faster). I'm willing to bet your other issue with sneak attacks is that you're being detected before you land the attack, so you're missing out on the bonus damage.