DS6 and DS4 are both bilingual from birth. I speak one language and DH speaks English to them. Neither Dh nor I are native English speakers. BTW I hope that excuses all my spelling and grammar errors on this board

DS6 was tested when he was 5.3 and the psychologist told us that his VIQ was lower than it really is. She recommended to retest him when he is 7. She even wrote it in his report. He still got gifted VIQ score but it was significantly lower than his PIQ. To be honest he is a math kid and I would still expect his PIQ being higher than VIQ. I also think that his younger brother will do better on the verbal test than he did. I do believe though that DS6 score was highly influenced by him being bilingual.
As for achievement testing his vocabulary is clearly his weakest point which isn't surprising. He still scored 2 years ahead though. He didn't do as well on the reading portion as I expected. I am not sure why. He is a good reader. He read Fantastic Mr Fox by Roald Dahl right before he turned 5 and Alice in Wonderland around the time of testing. It's the only part of the test where I saw lower numbers than expected. He excelled in spelling.
PM if you want more details.