Well the good news is you don't have to follow the guide to a T, the step-by-step is more for those who are very new to this and need a little hand holding.
The point of the motherboard section is to rule out the motherboard as the cause of instability. For example, some people will have a very nice overclocker like the X2 4000+ that can hit 2.8-3.1GHz, but at say 2.5GHz they run into trouble. Well without first testing the motherboard to see if it's even capable of a higher HT Link or reference clock, you can't rule out the motherboard as the source of instability.
You've more than proven the capabilities of your motherboard, it's a beast! We're not going to need to take the reference clock to 340MHz or beyond since we'll be using a higher CPU multiplier to overclock the CPU and memory, so we know your motherboard is good in that regard. We also know it can hit an astounding 1650MHz on the HT Link, so we have a lot of flexibility with your HT multiplier.
Consider yourself done with the motherboard section, on to finding the limits of your CPU! Try following the guide for that and let us know if you get stuck again. The good news is you won't have to lower your HT multiplier if you don't want to, but it's probably a good idea to drop it down to 4x if the HT Link reaches 1400MHz, anything past that might give you stability problems. Let us know how it goes.