I definitely don't understand the whole rake/trail thing entirely, but my experience on my O degree raked track bike with a 74.5 degree head angle is that of an unsafe, twitchy ride. With approximately 20 mm in tire profile, this results in 91.8 mm of trail which according to most would be a very slow handling bike. At speed, however, the bike threatens to snap the bars to the side if I make a quick steering adjustment. This has made me afraid to get out of the saddle to sprint and order a replacement fork with 33 mm rake as the 0 degree fork was a mistake to begin with.