Okay guys I figured out the reason for the huge roll off on those first graphs, it's because I didn't notice that somehow the receiver had slipped into "Direct" mode thus bypassing the subs all together. With all the other things I was trying to figure out I totally missed that. A simple solution.
I have to say once I got rolling with REW I started having a blast. Seeing whats going on in the room is very cool and provides a ton of much needed information. One thing I learned is that my nearfield sub is in a very bad spot. Which is exactly why I wanted to run REW, I wanted to discover where my system is struggling, after all what is the point of having a XV15se valued at $900 underperforming. On the other hand my corner loaded sub seems to be placed well.
In the graphs below are the dual subs running together with Audyssey engaged (red line) and without Audyssey (green line). I used 1/6 smoothing and the sweep runs from 15Hz to 200Hz. Please provide any thoughts on what you guys see here.
I did a lot of measuring and when I measured the corner sub by itself it had a very similar graph as the the dual subs had running together (see below). But when I measured the nearfield sub by itself it looked pretty bad. I thinks it's either not contributing much or its actually dragging down the system so I think I will have to move it. But before I did anything I wanted to post the latest measurements and see what you guys thought. Thanks again for your help guys.