Meteor MongoDB pub/sub memory error - mongodb

Question

I'm doing data visualizations using Meteor, running React and D3 for the view. Today decided to populate the MongoDB server with more documents (a total of 30 documents, netting ~50k lines each). There was no issue before running the database with 'only' 4 documents, but now I'm seeing
Exception while polling query {"collectionName":"Metrics","selector":{},"options":{"transform":null}}: MongoError: Query exceeded the maximum allowed memory usage of 40 MB. Please consider adding more filters to reduce the query response size.
This is my collections.js file, because autopublish is off.
if (Meteor.isServer) {
const remoteCollectionString = "notForHumanConsumption";
database = new MongoInternals.RemoteCollectionDriver(remoteCollectionString);
Meteor.publish('metricsDB', function() {
return Metrics.find({})
});
}
Metrics = new Mongo.Collection("Metrics", { _driver: database });
if (Meteor.isClient) {
Meteor.startup(function() {
Session.set('data_loaded', false);
console.log(Session.get('data_loaded'))
});
Meteor.subscribe('metricsDB', function(){
// Set the reactive session as true to indicate that the data have been loaded
Session.set('data_loaded', true);
console.log(Session.get('data_loaded'))
});
}
Adding any type of sort in the publish function seems to at least get the console to log true, but it does so pretty much instantly. The terminal shows no error, but I'm stuck and not getting any data to the App.
Update: decided to remove 10 entries from the collection, limiting it to 20, and now the collection is ~28MB large, instead of ~42MB for the 30 items. The App is loading, albeit slowly.
The data structure looks pretty much like this:
{
_id: BLAKSBFLUyiy79a6fs9Pjhadkh&SA86886Daksh,
DateQueried: dateString,
DataSet1: [
{
ID,
Name,
Properties: [
{
ID,
Name,
Nr,
Status: [0, 1, 2, 3],
LocationData: {
City,
CountryCode,
PostalCode,
Street,
StreetNumber
}
}
]
}
],
DataSet2: [
{
ID,
Name,
Nr,
Obj: {
NrR,
NrGS,
LengthOfR
}
}
]
}
In each document DataSet1 is usually 9 items long. Properties in there can contain up to ~1900 (they average around 500) items. DataSet2 is normally around 49 items.