I've had customers who on having worn out drivetrain replaced with same new stuff state the same thing, chain rub when in near crossover combos. When asked about the use of the shifter's trim function the reply is, sadly, often "what are you talking about" … So for years they never knew about their shifter's full features. That they didn't complain with the old stuff might be explained by looser tolerances on the original parts, proper adjustment when the new were installed, the rider's changing way of using their gearing or other possibilities. Andy