Sounds pretty reasonable
Regarding the speakers and the low end: if you are
really sure that you don't overdo the high pass filtering, then brilliant!
"Mixing desk in the corner" means you also put your monitors there? I've tried that once, it wasn't as bad as I expected...
By the way: my room is pretty small, too. Acoustics were "fine" originally, but not more. I also put absorbers behind the main speakers – which did help, but the greatest step forward was a session with a rented measurement mic and Room EQ Wizard (free!). As a result, I've plugged a dedicated hardware EQ between control room output and power amp, with just some steep 3/60 oct notches in order to correct the room resonances. Wow!!! Everything made sense from that moment on. You might try that as well, if you want to know more or less exactly what is going on acoustically.
About the levels: great that you could get accustomed to lower digital levels! It's so much easier to mix that way, isn't it?
Well, I think everyone has its own habits to start a mix, in my case it's drums and bass together. If the song is "loud" stylistically, I try to get the overheads transparent and crunchy first, then I aim for punch in the snare track. I start to look for a drum reverb now.
Bassdrum and bass complement each other, that's why I treat it more or less as one element, never ever solo. But of course that approach is different with more silent songs or electronic stuff.
When I think about it, I add the important tracks first. Vocals, then rhythm guitars or keys, still on mono Auratone!
It's just your own decision – respectively what the song calls for –
which instruments should be in front and which you want to push back a little (or a lot). If you don't have a vision for this, you won't be able to find the "pockets", EQ-wise or reverb-wise! Sometimes I add enormous amounts of crisp mids or top end, because I want that instrument right in your face. Sometimes I roll off the highs, to make it seem more distant. It's all a sonic picture of an imaginary stage. Even impossible stages can work, of course
but you have to "see" or "hear" them in your mind.
Then I add the remaining instruments' tracks, probably on main speakers now, keeping one thing in mind: regular breaks in order to reset my ears. Otherwise I may lose objectivity by focusing on these little sounds or pads, and in the end, these elements will be too prominent.
But that's my way of building a mix – other people start with the vocals, or mix completely dry, adding reverbs and dynamics last...
Just an insight...