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Our old 1940's brick, wood burning, fireplace has a natural circulation setup where it pulls cold air off the floor, runs it through 4 thick walled 4" pipes behind and over the burn chamber, and then dumps them out about chest high in the room. It's neat to get it rocking and actually feel the air "blowing" out those pipes even though there is no fan, just natural heat rise.
So in your case, I wonder if you actually blew those fans into the back, beside, and over the insert, with the hottest air coming out the top would take better advantage of natural heat rising.
Edit- I see that's exactly what you are doing already!
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