QUOTE:
I am assuming this has to do with bedding and food.

Try an experiment, and change only one variable, e.g. bedding.

Grab a few garbage bags of shredded paper from a local office and use the shredded paper for bedding.

Photograph the pound(?) of worms on entry to the composter, and at monthly intervals to see if the color changes. Since you have changed the bedding, maintain the same food.

In a separate experiment, try changing the food, but maintain the bedding (peat moss).

You might also consider further experiments where you add various known Good things. The scale of your operation my prohibit long-term implementation, but, as yet another e.g., my local coffee shop generates 5+ gallons of coffee grounds per day; you could run an experiment where you add a pound of coffee grounds per day and see what effect that has.

I think that experiments to determine yield of worms and consumption of feedstuffs are very difficult to measure, but color (and size) or worms is reasonably straightforward.