SPS polyp extension is not really an indicator of hunger, more like healthy and happy. Some take a long time to get adjusted to your specific system, and there are different growth rates, but I would say the most likely cause is you, you are watching it. Turn your back, become interested in something else for a couple months and it will get jealous, it will grow to try and get your attention, but you must resist!! If you start watching again it will RTN, you must be coy, play the role, be hard to get, then your relationship will be stronger than ever.