I dwell for one hour at 1050 then ramp down to 920 in 1.5 hours and then crash it. I agree with Rebecca that your ramp down may be too fast. I like Kervin's book for straight technical info. If the marbles are transparent you can check for residual stress after annealing using a pair of polarizing filters. Every now and then I do this with my marbles just to check that all is OK.
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