Thanks, Tony. Here's what I ended up doing:
I have the water incoming from the SC through a 3" line. Right now at 2,000 gph, draw down isn't too bad at all.
I poured in the K1 yesterday. I don't have the air diffuser yet (9" EPDM style). THe water was basically churning the K1 very little. I put in a line from the airpump anyway to just blow huge bubbles into the K1.
This morning I went to check on the pit, and the k1 is churning PERFECTLY.....
I should still add the air diffuser, right? Put it just above the drilled 3" cap?
Ethan