I just fell down a new rabbit hole !
Change your vertical scale to every 5hz. Every 10 make the measurement look flatter than it actually is. Yes, this is a huge rabbit hole. For me it has lead to new speakers, new subs, more subs and more amps. Also to a baffle wall system and EQ devices like MiniDSP 10x10HD's and a couple DBX Driverack PA2's. That cheap little mic can get very expensive.
I'll say one thing - you need to make sure you have long enough cables to connect everything - which I did !
Since my equipment is remote located, I have a long USB cable run to my rack, a spare HDMI cable to my rack and a 75' XLR cable.
Calibrating with a laptop made having cables to connect everything to the laptop essential. I'm going to work on the subs again tonight and see if I can improve things now that I've done it once and know how to set everything up.
Once you figure out to get all the subs to play nice together for maximum output the rest is relatively simple (especially with the newer Mini-DSP). This may arguably be the best upgrade I've ever done to my system although the learning curve was rather steep. It was well worth the time invested.