Sorry I don't do the REW. Just hold my trusty Rat Shack meter and dial and tweak. If I plot my measurements it is a flat line, because I dialed and tweaked until the measurements fit a flat line.
I found a nice room mode calculator and found a good place for the front IB. Will work out really great because it will put the drivers in an area of the attic we do not use for storage, or for my heat duct runs. Both my seat and my lovely wifes seat will be relatively smooth response once the front IB is in. Now if I can just convince her that I need to poke a hole in the ceiling.
