The dose of paracetamol and codeine in those pills are low, and you can't redose on codeine. I'd seriously suggest taking 8 or 10, that amount of paracetamol as a one off won't cause any significant liver toxicity (i've taken up to 12 many, many times and recently had a liver scan and I'm fine) and you need more opiates than usual, even with no tolerance, to alleviate a comedown. 8 or 10 with no tolerance will not just ease the comedown, it will make you feel like you haven't even taken any speed and get you a really awesome high. I'd strongly suggest going for it.