Here are the full instructions including system deactivation.
Have you already de-activated all accounts?
If not, here are the steps. (You have to de-activate all systems before doing the steps I mentioned above)
If you've already de-activated all systems on the cracked account then skip to step seven.
1. Go to the desktop psn website, here is the link https://auth.api.sonyentertainmentnetwork.com/login.jsp
2. Log in using the email and password of the cracked account. (The one with DLC's)
3. Now click "Media & Devices"
4. You should see an option that says "Games"
5. In the square that says "Games", click on the downward arrow below (or anywhere in the square) where it lists how many PlayStation systems you have activated.
6. Then click "De-activate all"
Note: you can only de-activate all systems once every 6 months.
Steps below are done on your PS3.
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7. Go on the cracked account with the DLC's
8. Go to transaction managements>download list
9. Once on download list, download the DLC you want.
10. Make them download in background
11. Switch to your primary account
12. It should be downloading on your primary account, if it is downloading on your primary, that means you did this correctly and you should now receive the DLC's.
Hope this helped
What you did wrong is you created a new account and downloaded the DLC's, you do not need to make a new account, you only need the cracked account and your primary account.