[Bent]

Kristi, the output that you are measuring at frequencies above 80 hz seems funny (funny, in that they are even there - let alone measurable.)
Do you know if your crossover frequencies on your Yamaha AVR are correctly selected? (is your YPAO - or whatever Yamaha calls their automatic room equalization system turned off?)

The AVR should be sending minimal levels - if any at all, above 80 hz (assuming you chose 80 hz as your initial crossover) to the '1500, so it looks to me like you might either have the AVR sending these frequencies to the BFD, or the room is contributing with sympathetic resonances (are you doing your test sweeps at a high relative level and making the house "shake"), or another possibility - your measurement equipment might be a bit off.

did you do these previous sweeps with your mains connected?

an outboard crossover between the receiver and the BFD will only show a change if the sweeps you've already posted don't include the outputs from the main speakers.

Either way, it looks like the deep bass is starting to shape up. I hope you are enjoying this and not finding it too tedious.