Damn another good one I hadn't thought of.
I have an update on my situation. I had a loop-back to redirect excess flow back to the sump return chamber (in retrospect, maybe I should have taken it over to where the other drains entered the sump). It was causing a good bit of splashing around, and I figured that may be the source of all the bubbles. So, I put a filter sock on it, and sure enough, the bubbles were drastically reduced. The weird thing is, the annoying sound has not come back since I did that about two days ago. I'm not sure why that would be, but I have my fingers crossed.
jds