All the images from the telescope with very bright stars show the type of "streamer" pattern radiating from them as shown below. This was with the 0.7 reducer.
I'd let the telescope acclimate from 6:50pm through 8:50pm before taking 3 images of the Pleiades that this is made up from. Even around 10:30pm bright stars in the images still look like that. At both times the defocused stars didn't show any signs of heat plumes inside the scope.
As an additional data point, while collimating the scope a number of spots appeared in the airy disk on both sides of focus.
I have some images taken without the reducer, but there weren't any stars bright enough to potentially cause the issue to show.