2 Corsair 3500 Problem

I have 2 Corsair PC3500 and they can do 292Mhz FSB each but when I put them together to take advantage of dual channel, they won't go higher than 275. I'm using them with a 2.4C and an Abit IC7-G. Does anyone know what the problem might be? I'me already using 2.8 mem volt. Should I go with the higher Ghz or more bandwidth?

Nice overclock

What timings are you running?

Probly a timing prob. Im running higher than that on my 3200.