Looking at that picture I thought I would take a better look at the cribbed end on each stack. The stack in the background is about the 3rd cribbed end I had done. Since then Ive started to put more inward lean to the ends. Maybe a bit more than I needed.
The cribbing looks good I've found that somehow my cribs end up going outward, and have never failed in that direction. Usually stacks fall front-back either from drying to much on sunny side or poor ground/leveling on my part. The downside to flaring them out is 8' sheets of tin don't cover the entire top of an 8' base