I am amazed Arlene. Six compost bins! That is one heck of a lot of work. But I think you said that was Jack's chore. I went to a compost and worm workshop yesterday as I am still trying to get the compost thing right. It's a challenge and I don't have any area to have nice big 3x3 bins that can be turned and such. Just two roller barrels. I did learn that I was wrong to continue to add kitchen scraps to a pile once it was built. Once the ratio is okay you just turn it and leave it alone (for the most part). Learned some tricks about how to get a pile working if it slows down. Also what constitutes good ingredients brown and green.
I am hoping that my mulching each year will being the same results as you have found. Fewer weeds easier to pull. I am ordering a 30# bag of preen on line as it is cheaper, even with shipping, than the small bags or boxes the stores have.