After talking to Alan at DirtyDog Performance, the stall speed is spot on what we were looking for - we simply need more lockup clutch.
The risk with multi-disc clutches is high revs. I've been told much over 7000 rpms and you risk grenading a multi-disc lockup converter. But after studying what data we have gotten so far, it is unlikely we need more than 7000 rpms the way the car is currently setup. The 1-2 shift is right at or just a tic over 7000 rpms. I need to bump up the 2-3 shift just a tad to peak at 7000. There should be a large gain with lockup in 2nd gear and a little bit more with lockup in 3rd gear.
I've had a couple opinions given to me that say the car may actually run mid to high 11s (based on running mid 12s with an 'open' converter).
I'm not so sure about that, but I do know the car was noticeably faster with lockup last year with the old motor. We tried leaving the converter unlocked as a test at a track rental and immediately went at least a half second slower (I need to find those timeslips). But if I can run 0.5 seconds faster, we can be low to mid 12s all motor with room in the tune for more.
I really wanted to go to NC this past weekend and run the car one final outing for the year but I couldn't see running the car knowing the converter wouldn't hold.