Thanks Miketree. You have a nice drawing
CMIIW: The diagram showed that you used half of the FET, right? The one you should know is which one has a bigger ouput; the stock FET or the 7389? I dont have any reliable source to compare them. I think the stock FET has a bigger one, since the 7389 gets hot. In my opinion, stacking the same FETs would be more effecient (considering to the FETs price).
But, it was a good experiment that inspired me to do some mods on my Z board, hehehe...
Salam,