ws. im good mate
1. your processor has a max multiplier of 8. you cannot increase that. (only procs with unlocked multiplier have the ability to increase it but theyre much more expensive).
2. from what ive heard, the p5ql-cm is a good overclocker. im using a foxconn p43 at the moment and ill be honest its not an amazing overclocker, i have to give quite a lot of vcore to get to 4.0 on my e6300. but ive also heard some good things about that msi p43.
3. your overclock can be limited by a lot of things - your board, your RAMs, your PSU. maybe youve hit the FSB wall for this mobo. have you tried increasing the vcore? also, what error do you get when you take the proc beyond 2.9?
4. can you post a cpuz pic showing the cpu tab and the ram tab?
5. id suggest sticking with the current setup and getting a 460 asap.