You can try upping the RAM timings for increased FSB performance. It may decrease overall gaming and benchmark performance, though. I've heard that setting it at 3-3-3-7 will allow greater FSB increases, but I've never tried it.
It's probably just your RAM. That's nice RAM, but I've heard good and bad things about Geil (most good). When a small FSB increase locks the PC, it's usually because of the RAM.
I'm sure your temps are decent with the Tornado in. I've heard it compared to a 747 landing in your room.
I'd be happy with 2.4 GHz, man! Damn! My 2500+ XP (unlocked) this past summer wouldn't go past 178 FSB because of my RAM. 200 is damn nice. I've personally never heard of anyone going past 205 FSB with the 2500+ unless they had water cooling.
Your southbridge or northbridge chipsets could be getting too hot. That tends to cause lots of problems and is usually hard to realize without extra thermometers.
I'd simply stick with 2.4 GHz and be happy.
-Lasereth