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I get the idea the BFD is used usually to decrease peaks and not increase dips. I'm looking to smooth response.
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Well, generally if you want to add gain with an equalizer you will be using up available headroom. A small amount of gain (<=5dB) is fine if it's effective. But that's the rub. There are some room effects that defy gain correction. You can throw all the voltage you want at your power amplifier and the effect is minimal in the room response at that frequency. Other dips respond quite nicely to gain. I have found that this is a simple trial and error to establish with REW.
But, and this is a big but, I would never use a BFD for full range duties. It will simply add too much noise. I have both personal and anecdotal evidence of this. It is not studio quality. Its use is restricted to subwoofer duties where the noise is inaudible.
I agree with Doug. Room treatment is your first avenue. I thought any EQ in a studio environment was considered bad form?
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How is it you can see the room response along with the speaker?
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I am making an assumption that the response you show is not the anechoic response of that set of speakers. You have a wide dip centered at ~75Hz that is almost -20dB. There ain't a chance it's the speakers fault. It's the room.
Usually anechoic speaker response is published - that should give you a better idea of what your speakers are capable of without room influence. There is a way of checking your speakers reflection free response with REW, but it severely limits the low frequencies in the response result - so that's not an option, but some people do a near-field response of their speaker outside to get a quasi-anechoic response.
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Do you see any problems with my testing/graph making, that may increase my results?
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No, it wouldn't hurt to read
this part of this sticky with respect to pre-impulse response window settings.
I think you're being kind to yourself using the vertical scale from 30Hz-105Hz. You might expand that to 45Hz-105Hz. The graph of course will look worse. You might modify your horizontal scale to start at ~30Hz. You aren't measuring a subwoofer, so the 15Hz you're using is too low.
I trust you're using the correct microphone calibration file and you've calibrated your soundcard...
brucek