Borderlands 2 Enemy Scaling Issues (underleveled enemies)?

Just a quick question on scaling, first playthrough (normal mode). I notice that in the DLC Content, Sir Hammerlock's Big Game Hunt and Mr. Torgue's Campaign of Carnage the enemeies are not scaling, they are leveled 29-32 and the game is basically no fun because I am level 37. I just finished beating the Warrior (at 36) then went right into the DLC campaigns to find severely underleveled enemies. However, with the same Character (level 37 Commando) same playthrough when I join Tiny Tina's Dragonhunt the enemies continue to scale to my level or even higher some are level 40 (Outside of the King Orc guy that levels up whiel you fight him).

With another Character I tried Playing The Scarlett Booty DLC and same problem, I beat the Warrior at Level 35 and joined the Oasis immediately after and there is not a single enemy above level 32.

I played almost all of Torgue's campaign and did not level, thats like 4 hours of gameplay stuck at 37. In my opinion it has basically defeated the purpose of the DLC its not helping me level up and with suck weak enemies it is not even fun to play, Badasses were yielding an entire 47exp.

Why does Tiny Tina's Assault on Dragon Keep Scale but not the other 3 DLC packages (normal Playthrough)?

Better on the Second Playthrough? (Sure Hope So)