It definitely can't hurt to take it again (I took it 3 times). I was basically just saying that you probably have a good chance of getting in to most, if not all places you apply to with your stats as of right now. And if I had your scores, I would not want to go through the whole process of having to re-take it and spend that money (I despise standardized testing, as I'm sure most of us do, haha). But if you want to improve, definitely go for it!
I do not think the writing score matters much at all (although this could depend on the school). My Audiology professor told us that most schools do not care about writing at all. I made a 4 the first time I took it, and then 3.5 the following two times.