Old Credit card debt

I am in the process of cleaning up 5 old credit card accounts that had been lingering around for 2-3 years on my credit reports. These 5 cards had low credit limits and the total for all 5 is $2500, small potatoes I know but at the time when I defaulted I was in the middle of a medical life and death situation (massive brain tumor). Only other thing I owe is my house note and I have never been late on that and I am 10 years into a 20 year note. Vehicles are all paid off and no other debt other than monthly expenses. What I have done is sent letters to two of these credit card companies offering to settle these accounts with a "pay and delete" offer. I picked the two smallest ones at 300ish each and offered 150 cash to clear this up. The first two I attacked were Credit One and First Premiere Bank. My question is woudl this be the right approach or should I continue? What else should I be doing? If I get this taken care of I will have excellent credit.