A SF2 is definitely needed to increase this o/c. I'll be working on that in the near future.
2.34GHz isnt bad but my xp2000 eats yours at 2.47GHz you still got lucky given the low voltage you pumped, but I hear DLT3c's hate high voltage anyway, they were built for very low volts while the DUT3c's can often tolerate 2v or even more. I doubt youd get much, if any higher overclocks but feel free to prove me wrong
You aren't Prime stable for two seconds at 2.2v at 2.47ghz...I got into Windows at 1.64v at 2.449GHZ...I'd say my CPU "eats" yours!

I'm definitely happy about my $59 investment!