So far I did 4 EBs, ASOF seems to pay the best for the number of action. Here are my data, you can see by yourself. EB / drops / actions on EB / ratio drop per action ASOF / 1038 / 180 / 5.8 SS(BR) / 240 / 120 / 2.0 ASOF / 1125 / 168 / 6.7 LOTL / 993 / 299 / 3.3 Edit: one more EB ASOF / 1076 / 308 / 3.5 It looks like the optimum for drops occurs between 150 and 200 actions per EB. So fast EBs with an average of 2 unloads is definitely the way to go.
Though this is true, often there seems to be a cap to each eb of possible numbers of tablets which can be earned. It's also nice to know how much a typical kawer would get from the eb, I guess.