Hi Buzz and hope you're learning these procedures and protocols as you venture in here. You mention:
I am powered by a Postwar ZW which runs my TMCC just fine.
The ZW is a fine transformer but please be aware that the stock circuit breaker is an old design and dangerous to use with the modern electronics found in most of our trains for the last 20 years or so. Would be highly advisable to install some modern fast acting circuit breaker protection before you damage any of your engines/locomotives.