Is your savannah a baby? He should be allowed to eat as much as he wants while growing. Down the road you may want to reassess his eating patterns/behavior/diet as he gets older but, for the purpose of answering your question in under 1000 words, don't worry about that yet.
Cut out the chicken hearts. Dusted crickets (calcium) and mice are fine. Don't get fancy - I've heard everything from Dog food (bad), to turkey, to eggs....I can only speak from experience but mice and crickets do the job. Roaches are fantastic, too.
Generally, feed every day, a few smaller meals per day is better than 1 big meal every other day. It's easy to keep crickets alive and happy in a seperate tank/"cricket keeper" for a while, just make sure you feed your crickets good food, too.
Sand, whether or not it will get impacted, is not the best choice for substrate. Try dirt, soil, or a mix of soil and sand. Your savannah will love to dig around in it, make a burrow for himself under something in your setup, and sand doesn't allow for that as it doesn't hold any shape. Backyard dirt is OK as long as there aren't any pesticides used. Find a friend that will let you dig some up. Make it deep enough to dig a burrow. Your monitor will be happier.

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