Perhaps bake a lil longer? How are you preparing your pans?
I've had this to happen to me once. Are you baking several cakes at once? The only time that this happened to me was when I baked 4 cakes at the same time. The 10 inch came out fine but the 8 inch that baked with them weren't brown at all but they were done. I bake 4 six inch cakes at once all the time and they always brown nicely.
ALton Brown says you need to rotate your pans if you see that your product is not baking evenly... so if some are baking fine and others are not... perhaps you can rotate half way through it...
When I bake multiples... my smaller ones always get done faster... so I take them out sooner than the bigger pans... and they are always nice and golden brown...
hth
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