I hear your point regarding the QHY8, however:
1. the QHY8 is a few hundred dollars more expensive;
2. the readout noise is much lower for the 320;
3. I plan on getting a short tube refractor soon;
4. (and most importantly) the 320 was a surprise present from my wife - so who am I to complain???
Anyway - thanks for the feedback. Good to know anything that helps to improve my imaging. As for the roundness of the stars - I think my wife's processing definitely helps.