I notice you do not have reading or writing achievement. That would be pretty key in looking at dyslexia. I would also look for some phonological awareness testing, such as the PAT2 or CTOPP-2. The PAL-II is another good instrument. You'll need to look for testing that examines nonsense word decoding/reading, so that he cannot cover any decoding weaknesses using memorized sight vocabulary. Do you have visual-motor data, such as through an OT eval? The PSI is concerning (although less so for a six y-o on the WISC).
