OK here is the chart I have been working on, green areas are possible with stock regulator , yellow I think I have found a replacement but going to have to change inductor also and red is external only. Now this is just for reference this is what worked for me, I did not go to far on the cooling aspect, no soldermask removal or anything other than the stock thermal pad. I am amazed that this chip can even handle this much power.



Overview of the setup, not much fancy, 12 AWG wires from the supply to the board.


Close up, see the power and clock input, temp sensor in the heatsink.


Signal generator.


This had been pretty interesting , would love to make a schematic of the device and make a new board, a lot of "if onlys"  
Hope this data can help someone.