That's insane man, but you do have apps that I would consider memory hogs, and are redundant or obsolete like flipboard. I just add my favorite publications on facebook.
The interesting thing is that this is not really "insane" usage. There is nothing too unusual running there (maybe only Wakelock detector). Yes, I do prefer flipboard that does use quite a bit of memory, but I'd rather use this instead of facebook or goggle now. I like the presentation and functionality of Flipboard. As a matter of fact there is no facebook app running (or installed) on my system. I think it is a worse offender when it comes to resource hogging (in many cases battery draining). I'm not a very active FB user and when I need it, I'd rather not use the FB app (just a browser). Also on my system there is no google now or google on tap running (those would be running on many other phones). I have completely got rid of new Google App and installed an older version that is faster, more efficient and doesn't bug me to use "cards" that I currently don't need and don't want.
Launcher is replaced with Apex that is quite light and very fast. It might be obsolete (haven't been updated in a year), but it does what I need better than the rest. I have purchased Nova Prime, tried a bunch of others and still came back to Apex. So there is only one launcher running and Oxygen Launcher was removed from the system. Not using shelf. Other people might get higher resource usage with stock launcher, many widgets and shelf running.
I have completely removed Google Photos. Gallery is the only gallery app (might replace it later with old version of QuickPic).
I also removed (or replaced) several other system apps that I don't use. I don't have most popular social apps either (no FB, no VK, no Snapchat, no Twitter, etc). No heavy games (like Asphalt or whatever else out there).
That being said, I think my system is actually quite optimized for my needs. My fairly high Screen On Time actually proves that all is working very nicely. This memory usage is not that unusual.
I don't use all of the following, but you might consider these apps that can fill up ram quite a bit: Launcher, System settings, Phone app, Texting app, Clock, Calculator, File Explorer, Browser, Gallery, Camera, Play Store, Maps, Gmail, Dropbox (or GDrive), Google App. Those are fairly commonly used. Add several tabs in the browser. Then add to these shopping apps (Amazon, ebay, etc). Then Music apps (Spotify or Pandora, Poweramp, etc). Then Video apps (Youtube, Netflix etc). Then social apps (FB, VK, Twitter, Snapchat, Instagram, Skype, Whatsapp etc). Then one or two games... and that memory is most likely will be filled quite a bit with cache. Nothing really insane.
