I agree with dearheart and the others about posting in 4a because of the chance of getting a response is greater.
I am 4b also, but thought at one point that I was 4a. It could be that people are 'misdiagnosing' their curls like I did. It was kinda hard to understand the curl thing without seeing an actual head in front of me (pics aren't always easy to see). I'm learning to love the hair that I was created with, regardless of curls or the lack there of. I actually have spirals, but they are soooo tiny, they get lost in manipulation when I'm doing my hair! And as for combating dryness and such, I've done LOTS of reading from a few boards! My friends can't believe how soft and manageable my hair is! Frequent washing/Cowashing, DC,leave-ins and moisturizers are gold!!