[IANNUZZI]

Owned Supra, rx7, 3000gt, 300zx, and 335i, all were the turbo versions and none of their ecus reduced boost as a result of knock(they all had knock sensors); the f10 m5 is no different as it manipulates timing to deal with knock:

"Knock has a lot to do with the octane rating of the gas that you put in the car. The recommended gasoline octane rating for the F10 M5 is AKI (Anti-Knock Index) 93 with AKI 91 as a minimum to not impair performance. Actually "octane rating" is a misnomer. While higher octane can prevent knock, it is not the only way of doing so. So AKI is the correct term.

However, as the engine is knock controlled, the lower ratings will not damage the engine. Higher AKI ratings mean the fuel can be compressed more before detonation, which means that more energy can be extracted during detonation. An overly low AKI will require the DME to retard timing to prevent knock which is inefficient and long-term damaging. Higher AKIs are of no use, since the car cannot increase compression ratios past its design point"

I have been following the bms boost controller since the beginning and it was made clear that the default setting of 2.25 was to be used with a min of 91 octane and the 3.00 setting was reserved for race gas. Given that, using 94 octane with the 3.00 setting can certainly cause a dyno chart like the one in question if timing is being pulled as a result of detonation. I doubt the computer is trying to protect the tranny.... Cheers