Matt: My Qs are all physically small and scamper quickly.
Some queens are naturally what I call SHY. They hide under bees and run a lot from frame to frame, hide under burr comb making finding difficult. However I have veteran queens that casually stroll about the frames without a care in the world as I hold the frames and watch in amazement. Some queens are shy almost appear frightened of light whereas some are calmed by light. I have seen both.
Upon hatching queens can vary in size considerably. I have seen queens hatch that were not much bigger than a worker, a cull to me and queens so big upon hatching one would think they were already bred.
I have some three year old queens that appear a bit smaller this year compared to their previous years. Also I notice some of my 3 year old queens appear darker as they age.
So to your specific question of do queens grow bigger????? After hatching, feeding a few days, and breeding MOST, not all, queens do get bigger compared to the Virgin she once was.. Queens do vary in size upon hatching, generally larger is better IMHO.