I got an IP-35 pro a few days ago and have been running this overclock

I've tried 3.8 Gh, but even with a increase in all voltages and ram timings relaxed to 6 6 6 15 from 5 5 5 12, after about 3 minutes of Orthos i get a blue screen. I think my quad has more left in it due to the temps, but I can't seem to get any higher. Do you guys have any advice on what voltages to play with or anything else. I'm still on the stock bios, and never flashed one before, so I'm a bit scared of doing that but do you think that a newer bios would help?

thanks