I haven't read through the entire thread, but in case it hasn't been mentioned. CWE is an excellent way to separate the codeine from paracetamol, but, codeine itself compared to stronger opiates like oxys and heroin is extremely weak - even in higher doses, for any regular opiate users out there this is more so to get rid of withdrawals and for those who don't just expect a nice warm fuzzy blanket for a few hours.
Also it's worth remembering that codeine has a ceiling dose, which I recall (could possibly be wrong - someone can confirm this) of around 400-500mg, so there is no point going any higher and risking paracetamol getting into your extraction. If you get a high and enjoy it, don't use regularly as you'll quickly get a tolerance and when you suffer from something that requires codeine for pain killing you'll struggle more to get rid of the pain.