Paul, I shall be seeking photometry that has the best possible SNR with a suitable time resolution (mutually exclusive!) to refine the ca 3.2 h period. To do, this I will be combining your data with other observers to get as long a baseline as possible. So please process your photometry with this in mind. If this is not suitable for the database (bearing in mind Andy’s guidance), then please send the data to me directly.
The upshot of all this is that 30 sec exposures are not really long enough, so stacking will help. But the real answer is to get your autoguider on line; I wish you luck with that. I have used 120 sec integrations with a C11, but which are not really long enough. Another observer is using 240 sec integrations.