That's too much in my opinion, given your tolerance. When I was a newbie to hydrocodone, 5 mg would have me feeling good. Remember these are both central nervous system depressants and mixing them can be dangerous. I would just use the hydrocodone by itself and totally leave out tramadol.
If you want to use valium, I wouldn't go over 10 mg, preferably 5 to start with. I feel better being cautious with this sort of thing. You can always take more later, but can't un-do once you've had too much!