So if your manual speed with L=6 has been tested, now increase L to 7 and probably you want to leave the N value same or one reduced, so you get the processor' speed almost close to the tested speed. All other values like A,LCD,turbo should be set common as mentioned before. Now add this speed and test it. Benchmarking success? Great, now you will see the smiley icon next to the speed, in green colour, meaning your processor is capable of handling that speed. Tap and hold on that speed and set it to favorites.

So now you found the best overclocked speed your processor could handle. Now get back to PHM' main menu where you see six icons. Now double tap on scale configuration and choose the best overclocking values. Choose upto 6 or 7 best speeds and in the bottom you will find a drop-down box for scaling method. Choose PHM simple. And that's it! You're done! Minimize the software and you will find your device working at amazing speeds! Next time you just need to open PHM and minimize it. And as mentioned before, heat is the only rival to processors, don't use the software when your device is hot. please close the program before putting your device to charge!

My personal experience:
I use Pocket Music Bundle for music. But it slows down your pocket pc completely as it delivers high-quality music. So when I use it along with PHM, I see my device running faster at a speed which you'll find when Pocket music is not running! But I can listen to music along with PHM only for two hours because the device gets hot & I have to close PHM and go with normal speed. Else my device freezes if I forget to and have to soft-reset my device.

Final note: Even two devices running on same processors, same speeds & from same manufacture will not be overclocked to same high speeds. I have tested two O2 XdaII mini and one gave 975 Mhz while the other gave only 878 Mhz! So lets see how much luck youve got!
Good luck on your overclocking and feel free to comment on this in our forum.