DivinylsFan If you think SP might be the problem, pull it out and see what happens. Don't save your progress; just quit and add back SP before playing forward.
If this helps, you can disable SP (General Options > Enable Progression > False) while in the University world, which won't affect the setting in other worlds. If you want SP active in this world, try reseting everything to default. You don't need to save your progress here either; this is just a test.
If the problem isn't SP, we can look elsewhere. For the sims piling up at the doors, you can try this mod:
https://modthesims.info/d/611709/university-student-union-library-shell-overrides-to-help-with-crowding-issues.html
HOWEVER, do not allow the mod to be present when you first start a new save, or the world won't have any sims in it at all. Just remove it when your sims aren't at University or about to travel there. And, as noted, the mod isn't compatible with NRaas GoHere.
As for importing SP settings, you would load a save that has the settings you want, then choose SP > General Options > Export Settings. This creates a file in Library that you can transfer to other user folders if necessary. Import Settinsg is in the same location.
NRaas Overwatch can also export/import settings from multiple mods at once, if you'd like to have one master file to use rather than one per mod. The only caveat is that Retuner settings don't always transfer properly this way. If you want to import Retuner settings, save those separately.