I have a hova bator 1602n, with an attached pc fan. Because I have a fan, I consider it a forced air incubator so I set it to 99.5 f But its so hard to keep a stable temp. It goes to 100 f, then cools to 98 f it dose it all the time. I have closed air vent and its not in direct sunlight. please help, I'm getting eggs soon.