Here's some guiding graphs from last night while I was taking 10min exposures of M16. I was using 5 sec guiding. I lost the star some time after the 2nd pic below - I haven't checked the results of all the exposures yet.
Beforehand I tried to improve the PA further. Adjusting the altitude was a lot more finicky than the azimuth and I think I will need to do a bit more there. Also, I'm not sure what the best DEC guiding algorithm to use - for this I used the resist switch.
However, overall I was fairly happy with the guiding results.