The room will be a mess, but I don't think the speakers in that location nor even the reflective surface are going to result in too little bass. I would expect boomy bass from the near corner placement.
Something is broken. One of the speaker polarities wrong, bad amp, etc. Replacing the speaker cables, using Roon (except for equalizer which you can do much cheaper), interconnects, DAC, and a bunch of other things is not going to make any difference. Find out what is broken and fix it.
Buy a microphone and learn how to measure your setup, then you will not need to guess.