For the majority of those looking for improvement, a turbo swap would not likely be a viable alternative. I do commend the effort, in the interest of discovery, invaluable.
I personally would like to gander deeper into the workings of the VVT, to see (as you probably have done, Jon) where some real benefit can be had to overheat resistance.
Can simply opening up the vanes get us back on track?
Is the VVT fighting itself (egt)?
EFI will be helpful in doing this analysis. First, it would be helpful to have an understanding, defintively, of the feedfoward and feedback mechanism, a mystery to some of us.