Im pretty sure the 60hz pal issue we have in the uk is down to the ps2's pathetic 4mb of video ram, as opposed to the g.c.'s 16mb and xbox 64mb shared.
See pal is technically superior to ntsc at 625 lines, opposed to ntsc's 500+.
Edge magazine spoke to kazunori yamauchi, and he said it is difficult to optimize for pal as the game is obviously designed for ntsc first and they are pushing the ps2 to the limit .. so basically they need more vram to fill the extra pal lines on the screen, hope that helps!