Hello Hiram,
I just bought a Thumblers Tumbler and am using 2# Lyman ceramic media. The first time I tried it I used enough water to cover the media, added 1 teaspoon of lemon juice, 1 level teaspoon of cream of tartar, 3 drops of liquid dishwashing soap, and tumbled 50 45/70 cases for approx. 2hrs. they came out fine. Did the same with 100 Hornet cases; same result. I know you have found a successful method, but this is another one.
I've received great comments on a 40/65 question this site, so its my turn to offer some assistance to fellow shooters.
Marty