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I used to live in a really old apartment building and ultimately there was nothing you could do. Fixing might help for a day or two, but that's it.
First, which screws and what type of door?
Why does it "slam shut?" Magic? Is there something else obviously associated with it "slamming shut," here?
Sometimes, pressure equalization and air movement in a building can force a door to slam shut. So, an entrance that has free flowing air corridors through to windows or outlets above, or just down through a large space, may have a large volume of air now attempting to move through the new egress - The doorway. Temperature can matter too, so a big volume of much cooler air is going to seek out that new exit to flow through due to a lack of resistance. Sometimes, air moving quickly across a doorway can create what's basically a "Venturi Effect" sucking air out of the building and through the doorway, catching the door and slamming it shut as it is drawn into the more rapidly, larger, moving volume outside. (ie: It's very windy outside and moving across the doorway, so it sucks the door closed instead of blowing into the building.)
Can you find a picture of the type of door you're talking about?
PS: Some external doors can be very heavy. In fact, some can even be filled with concrete... Some are hung in such a way that they must, due to the laws of nature, close. And, close surely. These are typically service exit doors that need to stay closed after people go through them and these tend to secure access to certain spaces. Those might not even have a handle on the outside, btw. But, some other doors do follow the same design principles, not desiring any other counterweight or force other than that of the door hung at a particular angle, itself. It's not a good idea to fudge around with that kind of design, especially without permission. :)
I've tried playing with the screws a little. But nothing i actually tried seemed to make it better. These 2 screws are really tight, which would make the door close slower. I think i'm not the only one messing with this door. I got up in the middle of the night. I've had huge apprehensions, but i did get out of bed and loosened a screw by 1/8 turn. Nothing else seemed to help, so i tried something else.I never noticed air pressure using the door. Buy it's a bit.. tight as far as air goes.
https://imgur.com/wYWtK56
I've tried to fix this type of door before, i never really got anything better than a door slamming. But... I think i can do this. i take the time, and i live by the door, i can hear... beta testing of the things i try. It's not a good idea, that much is obvious. I read about this multiple times on the internet. They would have the screw a lot looser than what it was set to.
It doesn't actually slams shut with a swing, it just makes a huge bang when it does close. I think i should check on my latest attempt, see if i should put it back. I never thought about a swing, there's a glass window next to the door, it's already cracked from before my messing around. I wouldn't want to have it break.
Instructions said tighten it to full and then give it 1/2 looser. I's been 1/4 at most. There's this huge bounce when it goes 20% from 70%. I never saw this on actual proper doors like this.
Just get a rug and put it down. They keep the door from closing on it's own let alone slamming shut. Also good for collecting dirt and such before you enter into your 'home'.
Good luck
https://www.youtube.com/watch?v=Q36pLS4AZAI
It has a brief bit on adjusting the closure rate on it. Recommended time is 5-7 seconds to close the door.
The big nut is tension for the spring, it seems. That's adjusted likely by weight of the door. (Dunno how they get footoounds out of it, but it may have some indicated markings.) The small screw he adjusts is for tuning it and would be what would normally be used. (Not sure if that pic is your door, but that plate looks like it was installed with an older closer. That newer replacement one may not be rated for that door?)
I wouldn't mess with the big nut. :) You don't have the chart that is mentioned in the vid.
Not sure if this helps. It looks similar to the model, but the cap is missing off the bottom spindle thing in the pic:
https://www.allmar.com/products/data/uploads/Canaropa_Door_Closer_700_Spec.pdf
(Dorex 700 model)
That might give you enough to go on to find out if you can do anything. Otherwise... if a few twists of that nut in the vid doesn't do it, call the landlord. (Note: That smaller nut is, I think, to adjust a sweet spot for the door activation range is, I think. Not sure.)