Photo of my sunken loaf - can you diagnose?

Toast

Made in a bread machine - all whole wheat flour.  Removed and it had a nice high dome which sunk as it cooled.  Here is the pic.  Any idea what it could be?  Machine has custom programming so I can adjust times for things.

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You could cut back on the yeast, or shorten the final proof time or temperature, or even increase the amount of dough by 5-10%. The latter will give you that full pan look without having to over proof to achieve it.

Paul