I have over 2000 hours in the A and L. I never really liked the procedure for the trq split. The 1st thing you should do upon noticing the split obtain single engine airspeed while checking RPMR. If it is high then you have a high side, if low you have a low side. If correct then slowly reduce the power on the high trq/tgt engine and see what the RPMR will do. If RPMR drops then put the engine throttle back where it was and take the low trq/tgt engine to lock out. Works for all the twins I have ever flown.
The problem is we never seem to check RPMR 1st to see what is happening.