You look amazing! I love reading your analysis b/c your purchases (and entire wardrobe) are so considered.
I am filing all of the info here for reference. I also have wavy hair, but it is fine and not plentiful, shall we say. I tend to blow mine out or straighten it. If I air dry it looks like a bad perm growing out. I've tried coconut oil but found it a bit heavy for me - even when I apply and then wash out (I do use it on my legs!). I don't mind a Sally Hanson product called Beach Waves or something like that...if I'm going wavy it helps tame the frizz. Your hair is looking fab!
ETA...no not sally hanson (that's nails right?!), sally something else I think it starts with a W...better double check that.