Ok, I created a small CAB file for anyone want to OC there 818 Pro. Please remember you need to use memmaid to insert the OmapClock.lnk to run when "wakeup", I also set the OC to 240Mhz, cause that is the reasonable speed to OC.
Here are the instruction.
1) Download the Mkap_OverClock.zip
2) Inside contain 1 CAB file, extract it
3) Run ActiveSync with your 818 Pro
4) Copy the CAB File into anywhere your 818 Pro
5) Run the CAB file, install into your Device
6) Run Memmaid, tap on the second icon from your left at the bottom
7) tap on "Add" button
8) Under "Program" choose the location of the lnk file "Windows\Start Menu\programs\OmapClock.lnk"
9) Select the "Event" menu and scroll down to "The device woke up" then tap "Add"
10) Soft reset your 818 Pro. Done
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Disclaimer
Please backup first before install the CAB file, I've tested with my own device, it worked very well, but I'm not too sure about others.