I can't answer your question about extended norms, but you'll find someone here who can help you with whether or not they would apply to these scores.
Re the processing speed - I wouldn't worry about it *unless* your ds is struggling in anyway at school or if you feel that he's underachieving relative to what you expect him to be doing based on his ability.
FWIW, my ds12 has a similar spread in processing speed vs VIQ/PRI, with a coding score of 10 - and for him it's an indication of developmental coordination disorder impacting his fine motor skills. What's key is that you can see the impact in other places too, not just the low coding score. For instance, his achievement testing scores show an obvious dip relative to ability when he has to answer using handwriting, and he was beyond miserable in early elementary before we realized he was dysgraphic - he refused to do homework, tore up worksheets and threw them across the room etc. If your ds is moving along happily in life, not refusing to do schoolwork etc, and all the "issues" you see are just that he could move faster and use more challenge, I wouldn't worry about the processing speed scores
Best wishes,
polarbear