Brief report:
Got it this time! Mark (ming21) and I came back for our 2nd attempt on Morrison (our 1st attempt defeated by snow conditions). Again we started up from Convict Lake at 5:08am. This time the snow had consolidated and it was cooler. We summited at 10:13am. Glissaded down the East Variation (hanging valley) and then bushwacked our way down to Convict Lake arriving back at the trailhead by 1:15pm.
Additional info about climbing Mount Morrison can be found here.