Well I searched for prior threads on HQing Hellfires, and one of the better ones I found was:
http://www.bluegartr.com/forum/35583-hellfire-1-a.html
However, as you might expect, it focuses on the GS sub primarily. I just had a friend with 100+3 BS / 60+1 GS / 35 WW try 5 synths and every single one broke.
I somewhat expected the WW cap to be around 19 (Walnut Lumber) since the GS cap is roughly the same as for GS Ingots. Does anyone know what the WW cap is?