OP, you said you have done a variety of drugs including oxy which is the closest thing drug wise on the list to hydro, but how much of it are you doing or have done?
I only ask because, if you've only used it a handful times like every now and then you probably don't have much of an opiate tolerance. In that case, take the two and that should be sufficient to get you high and feeling good. You probably won't need any more as it may make you sick and feeling nauseous. I forget myself because personally, I barely even feel 20mg but I've given that exact amount to friends in the past couple weeks, who have no tolerance, and it rocked their world. One friend actually got nauseuas from 20mg but nothing horrible. After smoking a bowl of weed he was just fine. Hope you have a good time!