5 day or 7 day doesn't really matter. Personally I start mine out on a 4 day then move them to an 8 day feeding schedule when they reach 500-600 grams.

As long as you don't see and mucus on the snake/ in the cage and there aren't any other signs of RI (do a search of the forum) You shouldn't have anything to worry about. What are the cage temperatures and humidity in your cage?