[Nux]

I believe your 0.81 lambda (about 11.9 AFR) is too rich at WOT. It should be more like 0.85.

Also you can retard to cam timing and move the curve up a bit.

And why not use 100RON (some places even has 102 these days).

You should be able to run 24 degrees all in on a twin plugged 911.

I used DC24 cams in a very similar package and was quite content. Very street friendly with a little high end kick. DC 40 or mod S cam (with a 113 LC since your're running speed density) is a lot of fun and will give much more top end, but it's always a compromise at the lower end.