I did some narrow letter cookies today. Normally, without any dehydration, they sink more in the middle. But with my dehydrator, they are completely poofy. I just snapped a quick pic to show you. (The picture is crappy, but I think it conveys the difference . . .) The pink cookie (un-dehydrated) has a slight depression along the middle, whereas the purple one (dehydrated) did not sink at all. I used the same icing (just colored differently) for each. Every now and then, there's still sinkage or cratering with the dehydrator (perhaps because I didn't leave the cookies in long enough), but the results are generally very consistently great! Out of the 60 or so narrow/tiny cookies that I iced today, only 2 sunk. In the past, w/o dehydration, almost all of them would have.
Would you mind sharing which dehydrator you use? I'm searching online now for dehydrators..not sure what I'm looking for though