Horizon's service is second to none!! If you are running your engine too fat you will be getting some fuel blowing out the carb too, again, just the nature of the beast.
As nice as the Saitos are I have always wondered why they are snotty pigs?? Most of my glow engines are OS or YS and they only blow snot out the muffler. I have two Saito 100s and had a 1.25 and they all did/do the same thing??
I say nature of the beast but it is pretty nasty.