The best virmicompost bedding for the best castings

I started my worm bin 5/24/19  I have not harvested the castings yet, they don't seem ready.  I didn't just want worm castings I wanted amazing worm castings.  My reason for doing this is not to compost household waist, I have a compost pile for that, I want a super product for my garden with out spending a ton.  I used 1 year old wood chips, some 1/2 done compost, coconut coir, and a little composted chicken manure, and a little cut up cardboard.  I am not worried it is taking much longer then I read it should, because I know it would because of the bedding, and with the heat we deal with I don't feed the worms as often as most, and honestly I'm thrilled they lived through the summer heat.  
Most of the research I did said to use cardboard, paper, and coconut coir as bedding, but to my mind it just seemed like better quality material would produce better quality product for my garden.  Since I'm new at this I was interested in the different things others have tried, and if you had better, or worse results.
I was thinking now that the weather should cool down soon and the worms should feel like eating more I may start another bin with alternate bedding to see what happens. Looking forward to your wisdom. Thanks

When I started my worm bins, I used arborist wood chips and leaves for the bedding. I fed my worms a combination of household scraps and spent spent coffee grounds - I have been collecting the grounds from a local cafe for the past six years and the worms love them. Just try to ensure that the grounds don’t become too dry. I have found old bags of grounds that have been forgotten and the worms have made their own way into the bags and colonised them. Where i’ve spread the grounds in paths and topped with wood chips, the grounds are teeming with worms. In my experience, coffee grounds are equally as effective as bedding and food for my worms.