Your results were heads and shoulders above the open chamber head because you performed mods that were heads and shoulders above what you did to the open chamber head. If you had done the same mods to the open chamber head and obtained the same compression, you would have a different opinion. You never compared the different heads on a one to one basis to know which is the better head.
Kirby was his right hand man and stepped into Sissell's shoes, but by no means did he fill them.
