That higher figure of 106 for Poland is just one data set but the true average is 92, which is much lower than japan. On some tests the japanese score as high as 113, but the average is 105. Germanys is 99, despite scoring 107 on the cattell culture fair, which is exact study you are referring to.
(source: http://www.ttu.ee/public/m/mart-mur...nifying_Construct_for_the_Social_Sciences.pdf)
The IQ range, or standard deviation is not higher amongst westerners, meaning the japanese bell curve is not a thinner shape than the western one. There is no data to support the iq range is narrower, so your argument doesn't hold up. Why are there more east asians in gifted programs if they had such a narrow range of intelligence? You need a mensa level IQ to gain entry to gifted programs, and there are more east asians in them :"For 1997, according to the Office of Civil rights (1999), 5.64% of the total enrollment was enrolled in gifted programs- 9.41% of Asians, 6.79% of White"
The visual spatial difference is more significant than 5 IQ points though. its 10 points i believe.
There's really no point discussing this any further with you. You're dead set on cherry picking the best data for Japan, and the worst data for the West. The best IQ data for the Japanese is taken from standardized tests, not real IQ tests. Given the stronger emphasis on education in Asian communities, that is not an accurate reflection of ability. An actual IQ test found am average IQ of 99 in Japan. Now I don't doubt that is on the low end, but the number of geniuses is obviously much lower in Japan or they would have made more contributions to society than simply copying Western ideas.