Are you having issues with it?
I'm assuming this is just some hacky code to
test it, since I would expect the setup to be in a config file somewhere (eg the number of Actors for your round robin).
But other than that I'm not sure what we can really say.
With Akka you're really looking at identifying bottlenecks, and that can only be done by actually running the thing and using the various tools to spot issues.
However, I'm not sure what would be cured by using something other than a round robin.