George C - thank you also for the reference to the thread... I just finished reading it and that was really helpful. DS subtest scores were:
VCI (similarities -15, vocabulary - 19, comprehension -16, information -18)
PRI ( block design-16, picture concepts - 15, matrix reasoning-17)

If I understand it correctly his subtest sum for 6 should be over 97 but I don't want to jinx myself due to low PSI. I am still trying to figure out what the low PSI means.