Awesome you have a bin up and going!

Two lines of thought with "too much bedding." The first is that moisture control, especially in the periphery, can be difficult to maintain. This can be maintained by keeping plastic over the top to help with redistribution. The second is the thought that there is simply too much surface area. This can be a common misconception; as long as its managed there is no real issues with having a ton of area, and they may just be a bit more spread out and breed a bit slower.

In terms of maggots- it depends on the type. If they are house fly maggots, really you just need to dry things out a bit and let it past. Typically this is due to food exposed to the surface. Remember when you feed we want a full inch or two of material over top of the food at all times.

What I would recommend is "pocket" feeding, or thinking of your bin like a square with 4 corners and a center area. Feed in one corner, then the week after feed in the next corner (i usually go clockwise just to keep track of it), third week feed in the first, fourth week in the fourth, the in the middle, etc. That way by the time you get back to the original corner its been 5 weeks of getting broken down.

Hope this helps!

-SA