I eat the same on training days as I do on non training days. The one difference is my pre and post workout shakes. Thats it.
Doing cardio wont really allow you to eat more without it being stored as fat, like weight training, cardio will just burn up some fat, so when you DO store some fat, the net effect is negated.
Personally, if I were you.. I would keep protein the same, slightly lower carbs, slightly increase fats.