Too me, that much variance in the suggested setting becomes a range of pressures for me. If I am going on a long trip or in the mountains, I'll set them to the upper end of that range. I too bump the front closer to the rear for better front end turn in, etc.

I adjust for tire wear over time too. But I seldom see more wear in the middle of the tires, implying that more pressure won't hurt. As far as ride quality, it is faaar better than the Z4, so no issue for me to set them high.

__________________
Richard
Sir Snaps-a-lot, 9 Time Dragon Slayer (54 runs!)
2011 X5 50i Alpine White, Biege Nappa /Lt Poplar M Sport
2009 Z4 35i, Black Sapphire/Ivory-Black/Anthracite

Gone but not forgotten: '08 550i, '06 X3, '06 650i, '02 M5, '99 540i