^^ i completely agree with your thoughts. I've felt your stutter before but only once.
Terry's business caters mainly to younger guys with the 335 that only care about XXX hp gained and that my car is faster than yours. All of his tunes are "beta" honestly. Thats his big disclaimer when things acts funky in customers cars. Support for the F10 has been a joke thus far. I mean the tune works and it does make the car more fun to drive but it isn't without compromise of some sort. Once i get my damn door sorted i will most likely give the Hartge tune a shot next spring. Maybe even though it on a dyne with the JB4 and then with the Hartge if i have the time.
Mineral White/Mugello 2016 F85 X5M