gsxr, i have same problem, i think same thing, cam timings. I also feel that there is more torque at higher rpms. m119 should have quite flat torque band according specs. But again, it is hard to me to measure without comparison to another 500E.
I have made full throttle accelerations only when engine has fully warmed up.
Does anyone know how ECU controls cam timings? There is cam sensors for both heads and also magnetic actuators to release oil pressure to timing change mechanism. Does ECU measure timing difference got from crank sensor to cam sensors? If this is under closed loop control, then there should be error log if timing is not right??