I like to consume some fat(Healthy fats from almonds, Natural p-nut butter, etc.) with my carb refeed meal. This help slow down the absorbtion of the carbs and helps to not increase insulin level too quickly. I stick with mostly Complex carbs on refeed meal(sweet potato, oats, greens, throw in some raisins as well for taste.)
I carb up every 3-4 days or so and it is just for 1 meal that day. The rest of the day I still consume the same amount of meals and the same ratios, just replace 1 of my regular meals with the carb meal.
Everybody responds differently in different situations. Best bet is to experiment with your diet, etc. and find what works best for you and stick with it.
Try to make sure your carb day is on a workout day.