Even though autoscaling isn’t without problems… verify if limits are set against (tcp) connections or (http) requests (docs), critical distinction between the two since one TCP connection may pipeline several http requests.
Try the new Machines platform which gives more control over how instances are spun up and down in response to demand. A big (documented) limitation right now is that the Machines platform doesn’t deal with the placement of 2 or more machines in the same region the way it should (also see).