I ran each of those grain bills through ProMash and adjusted the efficiency settings to obtain the expected gravity and your actual gravity assuming a 5 gallon batch.

Here are the results:

- Efficiency of 71% would give 1.053. Efficiency of 59% would give 1.044
- Efficiency of 60% would give 1.053. Efficiency of 68% would give 1.060
- Efficiency of 68% gives 1.050
- Efficiency of 75% would give 1.053. Efficiency of 63% would give 1.044

It seems that your efficiencies (which vary over 9 percentage points) are more consistent than the batches (which vary over 15 percentage points).

Are you sure that the recipies are all for the same batch size - especially recipe 2?

For batch 1 (where you got 59% efficiency) there is a substantial amount of wheat. As wheat grains ares smaller than barley, they may need to be milled with a smaller gap than barley (or milled twice). This could possibly explain why you only got 59% efficiency on batch 1.

Batches 2 and 3, you got 68% efficiency, but I cannot see any reason why reason why your efficiency dropped to 63% on batch 4.

-a.