Wondering what there is out there. I want a bit more challenge like smarter ai etc.. but i dont want it to lvl im frustrated at the game. Right now i just playingon Expert but i dont like how it makes me do less dmg i like it to be just enemy's getting better.

http://skyrim.nexusmods.com/mods/18436
http://skyrim.nexusmods.com/mods/3829

Those are two big ones.

You could also look into the likes of http://skyrim.nexusmods.com/mods/4429. (< Might also want to check out the "Highly recommanded mods to complete the hardcoe experience" section on that page)

How does deadly dragons work?

How much harder does it make them and the changes.

I suggest you read the description tab and see if it's for you It lets you customize some things, so if it's too difficult, you can change it.

RTFM , the text is on the first page...

I can also recommend:
http://skyrim.nexusmods.com/mods/5485
http://steamcommunity.com/sharedfiles/filedetails/?id=10434
http://steamcommunity.com/sharedfiles/filedetails/?id=11811
http://skyrim.nexusmods.com/mods/14449

I listed a bunch of mods here: http://www.gamesas.com/topic/1406518-good-mod-to-make-higher-levels-more-difficult/

Post to check this out later.
I don't know if it makes the game harder but Skyrims Monster Mod is very nice to use.