My experience with Maxell-branded, made in Japan media has been similar to yours. They are good discs, but made in Taiwan Prodisc have up to 10-20 times fewer PI failures.
Some more scans to digest, all four burned at 12x, in order of appearance:
8x Maxell +R, made in Japan,
8x Maxell -R, made in Japan,
8x Prodisc +R (Memorex-branded), made in Taiwan,
8x Prodisc -R (Fujifilm-branded), made in Taiwan.