More from the same page:
Here's my attempt to distill all the information presented so far:
(1) Never exceed the widest wheel rim-width specified by the tire manufacturer. This will usually be between 90% and 100% of the tires section width.
(2) As long as rule (1) is obeyed, the wider the rim, the better the cornering grip. Smoothness of ride may decrease as the rim gets wider, though.
(3) If you already have a specific wheel, mount the narrowest tire that will fit that rim if you want the most cornering grip.
So, if cornering grip were the MOST important thing, and considering the specific tread and section widths of the BF Goodrich Radial T/A, I should consider something more along the lines of:
front 15x7 with 195 / 60R15
rear 15x8 with 225 / 60R15
....uh, I don't think so.