BK is right, you need to keep your fans a few feet away from your burner, but I don’t think you should totally abandon them. With the custom made jackets from the LL stoves the fans would tie very easily into your existing ductwork. A setup like BKs might require a lot more work. I’d like to see pictures.
My stove shop said they don’t install booster fans under 4 feet. I went as far as I could, and it is 3 feet. I had 150 degree air blowing out of them at 840 cfm 4 feet from the duct fans. It sounds like you’re using two 8 inch fans, that sounds great. As you may already know I have a similar setup. (Two 8 inch fans off the stove, and one 6 inch fan with a line thermostat on my 2nd floor).
If you get good high temperature metal blade fans you'll be set. Air booster fans has 6 and 8 inch fans rated at 266 degrees. http://www.airboosterfans.com/
Your subject line said “Booster fans with Coal-Trol” but you didn’t mention that in your post. We can’t forget you were asking a specific question regarding this. The draw isn’t a whole lot more than a standard blower fan, its still less than two amps total. It all depends on how they built the circuits. But someone from the Coal Trol should be able to answer this better.