I second the wire rack theory and agree wholeheartedly with the temps. I drop my fish at 375 and watch the temp fall to 300-325. I let it cook until it is golden brown and delicious and is floating. The temp has typically recovered to 350ish by the time I start taking it out on to a wire rack on a big sheet pan. Pop into the oven on the keep warm setting and repeat until the fish and hush puppies are done.