Hey Rick,

Not sure what you mean by additional set of diffusers. I have 3 out there now. If your talking about a shallow and deep setup I don't need a shallow setup as here in Arknansas it doens't get cold long enough to warrant running a shallow air system. So I just shut mine off around mid to end of October and turn it back on right around now. Hope that answers your question.

The only difference between a rut and a Grave is the depth. So get up get out of that rut and get moving!! Time to work!!