Harry, I feel for you. These are my thoughts:
Your Cap1 acct. is only 2 years old. Plus they lost $3,300 on you when you settled with them. Therefore, they are probably not going to just forgive and forget. You can always try to GW, you should always try. But the general consensus is that they are not very forgiving.
If the $177 collection with DirectTV is not valid, then yes, dispute. If it is a valid charge, then a PFD is your best course of action. That works many more times than it does not.
You didn't state that your CR has any lates. If it does, you can GW them also.
Lastly, keep your balance on your cc low. No more than 10%. Even if it means totally not using it until you get the balance down, and going strictly cash.
Hang out on this forum. It contains a wealth of information on how to repair and build your credit. Good luck.