Put your CPU core voltage to 1.6V, your FSB speed to 210MHz, and your multiplier to 10.5, this will give you stable memory along with a higher core speed.
210 x 10.5 = ~2205MHz
Keep an eye on your temperature, AMD's have a higher threshold for temperature than Intel; you should be able to go to about 60C under load and still be stable.
Your memory should be 2.6V, but should run stable at 2.7V as it is good quality memory. This might also allow you to overclock your FSB higher.
[size=0.5]Full Aluminium ThermalTake Case
AMD Athlon XP 3200+ *400 FSB* Barton (2.2GHz)
ThermalTake Volcano 11+ Xaser Edition Air Cooling
1024MB Corsair TwinX XMS 3200 (Dual Channel 2x512) 2-3-2-6
256Mb XFX 7800 GS EXTREME
2x WD Raptors (10krpm 8MB Cache) 36.7GB using RAID -0
Video Logic SonicXplosion 5.1 Soundcard[/size]