I'm thinking your scope height is the factor, not faster twist.
Talley lows on both.... it's the twist having an effect on BC. There's no other explanation...
John.... I knew Litz agrees... I wasn't gonna bring that up though..... just reporting what I've seen personally. I also remember an old article in RifleShooter Mag, that showed an increase in BC with 10-15 different projectiles as twist rate went from standard 1-12" to 1-9" in a .22-250. In fact, the 50 grain bullets improved with added twist.... even though they're surely "stable" in a 1-12".
A 1-9" twist will spin a bullet 235,000 RPM at 2950fps.... the 1-8" will spin same bullet at 265,500 RPM.... That extra 30,000+ RPM ain't hurting the stability.
I've noticed the same thing shooting the .243 105 HPBTs out of the 1-10" vs. the 1-9".... a 1-10" "stabilizes" them.... but a 1-9" shoots them better, and with a noticeably higher BC (about +.025-.035).