My Lasius colony is still very small. They're going on their second year and have 20 or so workers, probably less. But there's a bunch of brood in various stages so hopefully they start growing soon. I also moved them into an actual formicarium so that should encourage them to grow in population size as well.
Your colony looks great and I can't wait for mine to get like that (not sure I'll brood boost though - probably not).