Our ds8 has similar sounding scores, lower on psi than 'normal' but otherwise about the same. We had a full assessment done and for us the main take aways was: social awkwardness is leading to ds being a very sad lonely guy and the ps slowness was compounded by this depressed state - like working in a fog, unable to focus, restless, timed tests were not good.
If your child is getting along well with others, has friends and feels good about themselves in this regard, probably this is not an issue, but if there is also social awkwardness and fewer/no close friends, you might want to consider the social piece as part of the puzzle.
I would agree with further assessment being key.
