Well if you are going to stick with box speakers, I'll give you some tips from when I was doing box speakers and EQ. First, if you can do bass traps, then those are the most effective in dealing with bass humps as well as dealing with the bass causing the room to ring.
Don't dismiss a swarm set of subs just yet, if you DIY them then you can make them to match your decor.
For now, the best thing to do is measure each speaker individually using RCA shorting plugs like these:
https://www.amazon.com/Shielded-Shorting-Filter-Noise-Canceling/dp/B01N0LNTTX/ref=sr_1_5?dchild=1&keywords=rca+shorting+plugs&qid=1625505255&sr=8-5Plug one in to one side of your amp and keep your regular RCA cable plugged in to the other side. Only one speaker will produce noise now. Measure, then switch the shorting plug to the other channel and measure the 2nd channel.
Compare the 2 measurements. You will notice that some peaks are the same from speaker to speaker but others peaks are different. The ones that are the same, you can use the EQ for both speakers at a time. For the humps that are unique to a particular speaker, EQ only that speaker to deal with them.
Other tips for EQ. Start with the humps that are lowest in the bass and work upwards. Because some of your higher level humps (and nulls) might be result of the things happening lower down. Also, only use 'cuts' in your EQ, never ever use 'boosts'. It's much better to drop bass humps and leave the bass nulls alone.