Adam....
Circle D does make great product, which is why that owner chose to go with them.
The gains you report however do not translate to the SHO platform unfortunately. The stock converter used in the SHO, thus far, has proven pretty stout.
The drivetrain loss you are experiencing in your SHO is typical across the board, no matter the model year. Yes it is HUGE.
The power split is approx 70/30.
There was a member named Jason who hails from WI. that was able to program off/out all the nannies using IDS, but not sure if he still is.
LMS won't do that as far as I am aware.
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