that's the way i like my slap to sound. a little clank works for me.
i suggest you play your bass for a while, get a feel for it, experiment playing harder and softer and get to know it. decide what you do and don't like, not from what you read but from what you hear and feel. then you can ask us about these thins.
but i don't suggest you backbow the neck ever, and i'm someone who plays with very low action. btw, a lot of the ibanez GSR200 and SR300 basses i've tried at the store for the last couple years have a backbow. the first thing i'd do is adjust it away.