I am gonna assume you are using the St10 as your imaging camera which has fairly large pixels from memory. So it is really not oversampling a lot. My setup oversamples at 0.68" per pixel. That means my brighter stars have 12-16 pixels coverage and so they appear to be bloated. Also when talking about bloat I am not talking about bloom. These concepts at quite different. Mathematically I am sure you are quite correct in what you are saying, but in real terms using a sensor with 5.4 pixels at 1600mm or higher is going to result in hugely over sampled images and bloated brighter stars when imaging at say 10 minute subs. Your system would have less trouble with this issue mainly because of you pixel size and well depth. Maybe I am looking at this all wrong but that is what I have understood so far.
