Taking it before meals that contain more carbs > taking it before meals that contain less carbs. This doesn't mean increase carbs for greater affect. Suppose I have 6 meals a day, 3 of which contain no carbs and 3 of which have high carbs, take it with the meals with carbs.
Are you having a PWO shake? Receptormax works great with Surge. Other than this I wouldn't increase carbs as you are not looking to gain weight(?)
If you are bulking absolutley increase carbs.
I hope this makes sense, let me know if it doesn't.