Great photo's Steve! Glad you saw it in relatively clear skies. Like many, we saw it through thin cloud.
Are you saying the only corona shots you got were 5 frames all at 1/250?
IF so, you can make some other exposures using these.
Stacking & adding the images can give you longer exposures, Stack and subtract or multiply can give you shorter exposures. then you can composite.
good luck.
Joe