Overclocking with OCZ Value RAM

Hi

I have a single stick of OCZ4001024V3 running in a DFI Infinity NF4 motherboard (Slot 1)- Latest BIOS installed

I have an Athlon 64 3000 (venice E6 - stock voltage), I have pushed the chipset to 1.7v from 1.5v dropped down - from DDR400 to DDR266 and run into trouble at 270 x 9
CPUID has the memory at 174.5Mhz
I can get into windows but always rapidly fail SuperPI - the memory is crimpin my overclock

Timings are as follows
Memclock Index Value (Mhz) 133Mhz
TCL - 3
TRAS - 8
TRCD - 4
TRP - 4
TRRD - AUTO -- not sure what to set this too (anything auto really)
TRC - 16
TRFC - 22
TRWT - 4
TWR - 3
TWTR - AUTO
TREF - AUTO
TWCL - AUTO
2T Memory Timings
Read Preamble - Auto
Async Latency - Auto
Dynamic idle cycle counter - Auto
DDR output driving - Auto
DDR DQ Drive strength - Auto
PDL Delay Adjust - Auto
DLL Speed Override - Auto
MTRR Mapping Mode - Continuous

Any settings I can try? I am looking to push this CPU up to high 2.7's


Thanks!