If you have legitimate pain you really don't want to start developing a tolerance or addiction. (Tram dependence is quite unpleasant due to the antidepressant withdrawals.)
50mg's wont make that much difference,try it? 100mg extra will probably get that feeling back, or anything up too 400mg max, which I don't really advise as you seem intolerant so 400mg's maybe a bit over the top and will eat straight through you're script.
If you take a week or so's break, at this point you should feel 100mg's again.
Not really recommended but benzos will enhance the high as well as safe guard you somewhat from seizures. If you don't take benzos then I wouldn't open up that can of worms neither.
Codeine 2+ hours or so in at a sensible dose also synergizes very nicely as does a beer or too, but don't go mixing anymore than 2 depressants and even then tread cautiously.