FMG 6.4.x hard-switch adjustment with CLI template

Did anyone know constraints with CLI templates in v6.4.x when you want to adjust members of a hardware switch like internal on an FG60x and create a second hard-switch interface with those freed up members?

What I'm experiencing seems to be... it works at the first time I pushed the change when I added the CLI template. But fails when I add more commands to the template or a new template to the template group to do more because the commands to adjust hard-switch would generate errors (like "delete 4" would error out because "edit 4" doesn't exist any more).

Or am I missing something obvious, which is causing this problem, and over thinking about CLI template limitations?

Toshi