You probably need to reinstall your gear.
Knowing installation of speakers , I will give you some Christmas advices.
Put away your microphone as a start. Roomcorrection shall only be done as the ”icing on the cake ” - the last thing you do.*
1. Plug the basstubes in you Kefs.
2. Put your main speakers on 50 cm high loudspeakerstands without subwoofer at the best sounding position in your room . Listen to bass melodies from the listening position to do this. Move your speakers distanse to the frontwall, and the distance between them. Where can you hear the bass melodies with a clear pitch without disturbing boominess ?
3. Start with moving your speakers 10 cm at each listening , narrowing down to centimeters in the end . Stop this when the best sound is obtained. This will take a couple of hours of fun listening.
You will find that only a couple of cm in different placement of the speakers can change the perceived tunes in the bass.
4. When your Kef sounds really good AND can play basstunes in an acceptable way without subwoofer its time to put your mono subwoofer exactly in the middle of your two Kef loudspeakers. Push the subwoofer against the frontwall. Start with a crossover frequency at 50 Hz - and then go upwards in frequency listening to the bassplayers melody in the bass from listening position.
Use 18 dB HP ( electrical ) for the main speaker and 30 dB LP ( electrical ) for the subwoofer , using your minidsp flex to do this . This will give you a slightly better sound than a 24 LP/12 HP crossover .
The power response in the room will be better using an odd order crossover .
Try 50 Hz , 55 Hz, 60 Hz , 65 Hz , 70 Hz and 75 Hz . All those with 30dB LP/18dB HP .
Adjust the level of the subwoofer.
During this - no measurements is needed. Save the crossover frequency that makes your speaker system play bass melodies in the clearest way, using your ears and listen to the tunes.
If correctly installed- the whole sound including subwoofer in the system will sound better than without it.
Use this record by Robert Plant to tune your system - the song ” little by little ” .
The sound will be better with TIDAL.
5. After this is done - correct the rooms fundamental resonances. You will have three of those in a normal rectangular room , all below 80 Hz . This has nothing to do with your speaker placement but depends entirely on the geometry of the room.
Those 3 fundamental room resonances will be : Wall/wall , floor/roof, wall/wall.
Use a sinesweep measuring from listening position ( from only one point ! ) and you will see that you have three big peaks in the response below 80 Hz.
Use the mini dsp flex to correct those resonances with HALF THE VALUE that the measurement microphone shows.
One example : If the measurement shows +12 dB at 44 Hz , you print - 6 dB at 44 Hz with a similar Q as the resonanse.
After you have done this - the music will sound better and not worse with correction. As I have shown, Dirac is not needed at all. This method can also be done manualy in GLM with Genelec monitors, or with any dsp crossover with DIY speakers.
————
*Playing with roomcorrection programes can be a serious waste of lifetime searching for the best possible sound, which is impossible without doing correct installment of the speakers in the first place .
Edit: correcting frequencys that are reflections and not fundamental room resonances, are never entirely beneficial to the sound - be very careful to correct reflections between 80-250 Hz, measured from listening position. From 250-20000 Hz , nothing can be corrected with good results from listeningposition .