So maybe mass-multitabling the 10ers isn't working for me? I played a set of four while doing the dishwashing for 63%, then 26 in a set of 17 and five replacements, and lost a hundred bucks. Since then I've eighttabled three sets and played a couple while working for 40%.
It seems pretty incredible that I should coincidentally run hot when I play fewer tables and cold when I play more, but I think that's what happened. Still, I think I'll stick to eight-tabling for now, and add extras more slowly.