Trained (ex)Professional, , 1953-2018 RIP,
Sorry, forgot to reply to this.Jim,
Improving the scavenging will allow more fresh fuel/air into the combustion chamber in place of the residual exhaust gasses. Improved scavenging will result in more air flow during the overlap period and L-Jet will add fuel to compensate. These two things will result in more torque.
Please read this thread for an explanation.