I'm definately no expert but looking at your graph with the peak at 30 Hz and your comments that you're lacking the bass you can "feel" I'm thinking that some EQ just might do you some good. Then again the response is much better than most people get with no treatment, so you certainly can't complain about what you've got.
It looks like you're trying to calibrate for 75dB and you're right on from 18Hz to the low 20's. However, the output then rises until the 30 Hz peak at 89dB (over 2.5x louder than your 75dB target) which in my opinion is probably drowning out the low "tangible" bass that you wanted.
If I were going to take a wild swing at it I'd probably go with a filter at 32+2 with a gain of -10 and a bandwidth of 15/60. This should reduce your 30 Hz peak by 10 dB to about 78dB while at 24.5 Hz and 43 Hz you'd be only 3dB down from what you've measured. That's roughly the right bandwidth I think to kill the whole peak without bringing down the surrounding area much. A second filter would be something like 63-6 with a gain of -8 and a bandwidth of 8/60. With that filter the points that would be down 3dB from your current measurement are 46 Hz and 68 Hz. I would leave it with just those 2 filters. Hopefully if all goes well you'd be very flat from ~17-92 Hz and you'd have skillfully avoided making those two dips much worse.
Anyways, like I and others said, your existing response is very good, and may not be worth buying a BFD over. On the other hand, if you want to blow $100 on a new toy and have some fun you can probably turn it into a phenomenal graph with no more than two filters. You should play around with the filter settings in REW though and simulate the expected response as if you had the BFD. That could give you an idea of what to expect and if you feel it's worth it. If you really wanted to humor me you could even plug in my two filters and post the new graph for us to see
