What you have done looks pretty good. Sounds like you hit the wall for your hardware on those BIOS settings. Your options include:
-- increasing voltage to RAM
-- changing the strap to reduce the RAM frequency
-- increasing RAM latency timings,
-- maybe increasing voltage to CPU
-- maybe increasing voltage to northbridge
Or you could try increasing the FSB frequency a few MHz, attempt to boot to windows, then:
-- changing the strap to reduce the RAM frequency
-- increasing RAM latencies
-- increasing voltage to CPU
-- maybe increasing voltage to northbridge
OCing isn't successful unless you can work within your operating system. OCing to get the very highest performance from your hardware usually involves trying numerous combinations of the settings your BIOS allows.