If you can upload the 3MF for this model I’d be willing to look at the settings. I always love a challenge. 
From what I can see, there are extrusion issues at the bottom which could be improved–not eliminated–by modifying temps and and/or flow rate. The model orientation may have more influence. Also, don’t expect great results from Bambu Matte PLA, as I’ve stated in other posts, on a scale of 1-10 for model fidelity, it is about a 3. I’ve had much better results with Overture, Jayo and 3DHoJor Matte filaments, 3DHoJor usually being far less expensive($13 or $0.37/oz).
I also see evidence of the walls being too thin. But I would be guessing without direct access to the model.
However, at the end of the day, you may be expecting too much of the technology if you feel your overhangs should look like your walls… gravity sucks and it is very egalitarian… it sucks equally for everyone… filament and people alike. 
Why do you think that Resin prints looks so great? They print them in a liquid bath hanging typically upside down at resolutions that are 4-8x than that which can be achieved with FDM technology without the sag. So why doesn’t everyone use resin? Because it’s got really bad fumes and must be used in a well ventilated area, it’s messy, more expensive, a whole lot sloooower and the prints are best suited for smaller objects–not functional parts–that one paints afterwards. In other words, Dungeons and Dragons figurines or artistic pieces. You can do some very cool thing with resin that you just can’t do with FDM but on balance, FDM is much easier to use in my limited experience.