Any ideas would be most appreciated!
...... Why are you doing this? What are you trying to achieve?
Mostly overclocking will only increase speed in a measurable way (ie. benchmark) and not be noticeable in an everyday working way.
MY idea for what it is worth, is don't do it. You obviously are experimenting ( with potential danger btw) but it is your money and your choice.
It can be fun though and if you've got the money for a new motherboard etc the carry on.
Enjoy and good luck!